cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17188/1298520
title: Materials Data on Sr4Br6O by Materials Project

description: Sr4OBr6 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Sr2+ is bonded in a 7-coordinate geometry to one O2- and six Br1- atoms. The Sr–O bond length is 2.53 Å. There are a spread of Sr–Br bond distances ranging from 3.12–3.28 Å. O2- is bonded to four equivalent Sr2+ atoms to form distorted OSr4 tetrahedra that share corners with sixteen BrSr4 tetrahedra and edges with four equivalent BrSr4 tetrahedra. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded to four equivalent Sr2+ atoms to form distorted BrSr4 tetrahedra that share corners with two equivalent OSr4 tetrahedra, corners with twelve BrSr4 tetrahedra, an edgeedge with one OSr4 tetrahedra, and edges with four BrSr4 tetrahedra. In the second Br1- site, Br1- is bonded to four equivalent Sr2+ atoms to form BrSr4 tetrahedra that share corners with four equivalent OSr4 tetrahedra, corners with eight equivalent BrSr4 tetrahedra, and edges with six BrSr4 tetrahedra.
DOI: 10.17188/1298521
title: Materials Data on LiBiB2O5 by Materials Project

description: LiB2BiO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra and corners with four equivalent BO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.89–1.95 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.37–1.43 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with two equivalent BO4 tetrahedra and corners with four equivalent LiO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.46–1.60 Å. Bi3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Bi–O bond distances ranging from 2.21–2.96 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one B3+, and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Li1+, one B3+, and one Bi3+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+ and two equivalent B3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two B3+ and two equivalent Bi3+ atoms. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one B3+ and two equivalent Bi3+ atoms.
DOI: 10.17188/1298522
title: Materials Data on Rb4SiO4 by Materials Project

description: Rb4SiO4 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Rb–O bond distances ranging from 2.79–3.32 Å. In the second Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Rb–O bond distances ranging from 2.82–3.28 Å. In the third Rb1+ site, Rb1+ is bonded to four O2- atoms to form distorted RbO4 tetrahedra that share corners with four equivalent SiO4 tetrahedra and an edgeedge with one RbO4 tetrahedra. There are a spread of Rb–O bond distances ranging from 2.75–2.91 Å. In the fourth Rb1+ site, Rb1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Rb–O bond distances ranging from 2.81–3.06 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent RbO4 tetrahedra. There is three shorter (1.68 Å) and one longer (1.69 Å) Si–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to five Rb1+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to five Rb1+ and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to five Rb1+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to five Rb1+ and one Si4+ atom.
DOI: 10.17188/1298523
title: Materials Data on Y2GeO5 by Materials Project

description: Y2GeO5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded to seven O2- atoms to form distorted YO7 hexagonal pyramids that share corners with two equivalent YO7 hexagonal pyramids, corners with three equivalent GeO5 trigonal bipyramids, edges with five YO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Y–O bond distances ranging from 2.28–2.43 Å. In the second Y3+ site, Y3+ is bonded to seven O2- atoms to form distorted YO7 hexagonal pyramids that share corners with two equivalent YO7 hexagonal pyramids, a cornercorner with one GeO5 trigonal bipyramid, edges with seven YO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Y–O bond distances ranging from 2.32–2.38 Å. Ge4+ is bonded to five O2- atoms to form distorted GeO5 trigonal bipyramids that share corners with four YO7 hexagonal pyramids, corners with two equivalent GeO5 trigonal bipyramids, and edges with four YO7 hexagonal pyramids. There are a spread of Ge–O bond distances ranging from 1.77–1.95 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Y3+ atoms to form a mixture of corner and edge-sharing OY4 tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Y3+ and one Ge4+ atom. In the third O2- site, O2- is bonded to three Y3+ and one Ge4+ atom to form distorted OY3Ge tetrahedra that share corners with eight OY4 tetrahedra and edges with three OY3Ge tetrahedra. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Y3+ and two equivalent Ge4+ atoms. In the fifth O2- site, O2- is bonded to three Y3+ and one Ge4+ atom to form OY3Ge tetrahedra that share corners with eight OY4 tetrahedra and edges with two equivalent OY3Ge tetrahedra.
DOI: 10.17188/1298524
title: Materials Data on NaSbAsCO7 by Materials Project

description: NaCSbAsO7 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.22–2.98 Å. C3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.23 Å) and two longer (1.35 Å) C–O bond length. Sb5+ is bonded to six O2- atoms to form SbO6 octahedra that share corners with four equivalent AsO4 tetrahedra. There are a spread of Sb–O bond distances ranging from 2.09–2.20 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent SbO6 octahedra. The corner-sharing octahedra tilt angles range from 42–50°. There is three shorter (1.73 Å) and one longer (1.74 Å) As–O bond length. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Na1+ and one C3+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one C3+, and one Sb5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one C3+, and one Sb5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sb5+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Sb5+, and one As5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Sb5+, and one As5+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Sb5+, and one As5+ atom.
DOI: 10.17188/1298525
title: Materials Data on Li3Bi(BO3)2 by Materials Project

description: Li3Bi(BO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form a mixture of distorted edge and corner-sharing LiO4 trigonal pyramids. There are a spread of Li–O bond distances ranging from 1.95–2.13 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form a mixture of edge and corner-sharing LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.97–2.11 Å. In the third Li1+ site, Li1+ is bonded to four O2- atoms to form a mixture of edge and corner-sharing LiO4 tetrahedra. There are a spread of Li–O bond distances ranging from 1.89–2.04 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B–O bond distances ranging from 1.39–1.41 Å. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.38 Å) and two longer (1.39 Å) B–O bond length. Bi3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Bi–O bond distances ranging from 2.37–2.78 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Li1+, one B3+, and two equivalent Bi3+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one B3+, and one Bi3+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one B3+, and one Bi3+ atom. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to three Li1+, one B3+, and one Bi3+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one B3+, and two equivalent Bi3+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one B3+, and one Bi3+ atom.
DOI: 10.17188/1298527
title: Materials Data on BaSrI4 by Materials Project

description: BaSrI4 crystallizes in the trigonal R3c space group. The structure is three-dimensional. Ba2+ is bonded in a 6-coordinate geometry to six I1- atoms. There are a spread of Ba–I bond distances ranging from 3.32–3.88 Å. Sr2+ is bonded to six I1- atoms to form distorted corner-sharing SrI6 octahedra. The corner-sharing octahedra tilt angles range from 9–42°. There are a spread of Sr–I bond distances ranging from 3.16–3.53 Å. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a water-like geometry to one Ba2+ and one Sr2+ atom. In the second I1- site, I1- is bonded in a 4-coordinate geometry to two equivalent Ba2+ and two equivalent Sr2+ atoms. In the third I1- site, I1- is bonded in a T-shaped geometry to one Ba2+ and two equivalent Sr2+ atoms. In the fourth I1- site, I1- is bonded in a 3-coordinate geometry to two equivalent Ba2+ and one Sr2+ atom.
DOI: 10.17188/1298528
title: Materials Data on Li2Cu2(SO4)3 by Materials Project

description: Li2Cu2(SO4)3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Li1+ is bonded to five O2- atoms to form distorted LiO5 trigonal bipyramids that share corners with two equivalent CuO6 octahedra, corners with three SO4 tetrahedra, an edgeedge with one CuO6 octahedra, an edgeedge with one SO4 tetrahedra, and an edgeedge with one LiO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 55–79°. There are a spread of Li–O bond distances ranging from 2.00–2.25 Å. Cu2+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with six SO4 tetrahedra, corners with two equivalent LiO5 trigonal bipyramids, an edgeedge with one CuO6 octahedra, and an edgeedge with one LiO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.98–2.66 Å. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four equivalent CuO6 octahedra, corners with two equivalent LiO5 trigonal bipyramids, and an edgeedge with one LiO5 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 34–59°. There is two shorter (1.47 Å) and two longer (1.51 Å) S–O bond length. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four equivalent CuO6 octahedra and corners with two equivalent LiO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 17–37°. There is two shorter (1.46 Å) and two longer (1.52 Å) S–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Li1+, two equivalent Cu2+, and one S6+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to one Cu2+ and one S6+ atom. In the third O2- site, O2- is bonded in a bent 150 degrees geometry to one Cu2+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+, one Cu2+, and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted T-shaped geometry to two equivalent Li1+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+, one Cu2+, and one S6+ atom.
DOI: 10.17188/1298529
title: Materials Data on PrAsO4 by Materials Project

description: PrAsO4 is Zircon structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight equivalent O2- atoms. There are four shorter (2.45 Å) and four longer (2.54 Å) Pr–O bond lengths. As5+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All As–O bond lengths are 1.72 Å. O2- is bonded in a 3-coordinate geometry to two equivalent Pr3+ and one As5+ atom.
DOI: 10.17188/1298530
title: Materials Data on KNdO2 by Materials Project

description: KNdO2 is H-Phase structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. K1+ is bonded to six equivalent O2- atoms to form distorted KO6 pentagonal pyramids that share corners with six equivalent NdO6 octahedra, edges with six equivalent NdO6 octahedra, and edges with six equivalent KO6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 13°. All K–O bond lengths are 2.88 Å. Nd3+ is bonded to six equivalent O2- atoms to form NdO6 octahedra that share corners with six equivalent KO6 pentagonal pyramids, edges with six equivalent NdO6 octahedra, and edges with six equivalent KO6 pentagonal pyramids. All Nd–O bond lengths are 2.42 Å. O2- is bonded to three equivalent K1+ and three equivalent Nd3+ atoms to form a mixture of corner, edge, and face-sharing OK3Nd3 octahedra. The corner-sharing octahedra tilt angles range from 0–43°.
DOI: 10.5517/ccdc.csd.cc269wv8
title: CCDC 2035300: Experimental Crystal Structure Determination

description: Related Article: Jia-Ming Guo, Xiao-Zu Fan, Hui-Hui Wu, Zhe Tang, Xiao-Fan Bi, Heng Zhang, Lu-Yu Cai, Hong-Wu Zhao, Qi-Di Zhong|2020|J.Org.Chem.|86|1712|doi:10.1021/acs.joc.0c02524
DOI: 10.17188/1298531
title: Materials Data on Lu2GeO5 by Materials Project

description: Lu2GeO5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Lu3+ sites. In the first Lu3+ site, Lu3+ is bonded to seven O2- atoms to form distorted LuO7 hexagonal pyramids that share corners with two equivalent LuO7 hexagonal pyramids, corners with three equivalent GeO5 trigonal bipyramids, edges with five LuO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Lu–O bond distances ranging from 2.23–2.35 Å. In the second Lu3+ site, Lu3+ is bonded to seven O2- atoms to form distorted LuO7 hexagonal pyramids that share corners with two equivalent LuO7 hexagonal pyramids, a cornercorner with one GeO5 trigonal bipyramid, edges with seven LuO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Lu–O bond distances ranging from 2.27–2.32 Å. Ge4+ is bonded to five O2- atoms to form distorted GeO5 trigonal bipyramids that share corners with four LuO7 hexagonal pyramids, corners with two equivalent GeO5 trigonal bipyramids, and edges with four LuO7 hexagonal pyramids. There are a spread of Ge–O bond distances ranging from 1.76–1.92 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Lu3+ atoms to form OLu4 tetrahedra that share corners with fourteen OLu4 tetrahedra and edges with four OLu3Ge tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Lu3+ and one Ge4+ atom. In the third O2- site, O2- is bonded to two Lu3+ and two equivalent Ge4+ atoms to form distorted OLu2Ge2 tetrahedra that share corners with six OLu4 tetrahedra and edges with five OLu3Ge tetrahedra. In the fourth O2- site, O2- is bonded to three Lu3+ and one Ge4+ atom to form OLu3Ge tetrahedra that share corners with nine OLu4 tetrahedra and edges with four OLu3Ge tetrahedra. In the fifth O2- site, O2- is bonded to three Lu3+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OLu3Ge tetrahedra.
DOI: 10.17188/1298532
title: Materials Data on Sm2Cu2O5 by Materials Project

description: Sm2Cu2O5 is Spinel-like structured and crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. there are two inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing SmO6 octahedra. The corner-sharing octahedra tilt angles range from 28–66°. There are a spread of Sm–O bond distances ranging from 2.30–2.41 Å. In the second Sm3+ site, Sm3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing SmO6 octahedra. The corner-sharing octahedra tilt angles range from 28–66°. There are a spread of Sm–O bond distances ranging from 2.29–2.40 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.95–2.03 Å. In the second Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–2.04 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Sm3+ and two Cu2+ atoms to form distorted OSm2Cu2 trigonal pyramids that share corners with six OSm3Cu tetrahedra, corners with two equivalent OSm2Cu2 trigonal pyramids, an edgeedge with one OSm3Cu tetrahedra, and an edgeedge with one OSm2Cu2 trigonal pyramid. In the second O2- site, O2- is bonded to three Sm3+ and one Cu2+ atom to form OSm3Cu tetrahedra that share corners with six OSm3Cu tetrahedra, corners with six OSm2Cu2 trigonal pyramids, and an edgeedge with one OSm2Cu2 trigonal pyramid. In the third O2- site, O2- is bonded in a distorted see-saw-like geometry to two Sm3+ and two Cu2+ atoms. In the fourth O2- site, O2- is bonded to three Sm3+ and one Cu2+ atom to form OSm3Cu tetrahedra that share corners with six OSm3Cu tetrahedra, corners with six OSm2Cu2 trigonal pyramids, and an edgeedge with one OSm2Cu2 trigonal pyramid. In the fifth O2- site, O2- is bonded to two equivalent Sm3+ and two Cu2+ atoms to form distorted OSm2Cu2 trigonal pyramids that share corners with six OSm3Cu tetrahedra, corners with two equivalent OSm2Cu2 trigonal pyramids, an edgeedge with one OSm3Cu tetrahedra, and an edgeedge with one OSm2Cu2 trigonal pyramid.
DOI: 10.17188/1298533
title: Materials Data on Na2SnCSO7 by Materials Project

description: Na2SnCSO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.30–2.85 Å. Sn2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sn–O bond distances ranging from 2.26–2.67 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.26–1.33 Å. S6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of S–O bond distances ranging from 1.48–1.51 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Na1+ and one C4+ atom. In the second O2- site, O2- is bonded to two equivalent Na1+, one Sn2+, and one C4+ atom to form distorted edge-sharing ONa2SnC trigonal pyramids. In the third O2- site, O2- is bonded to two equivalent Na1+, one Sn2+, and one C4+ atom to form distorted edge-sharing ONa2SnC trigonal pyramids. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Sn2+, and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+, one Sn2+, and one S6+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+ and one S6+ atom.
DOI: 10.17188/1298534
title: Materials Data on Ca(ClO3)2 by Materials Project

description: Ca(ClO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.36–2.82 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two equivalent Ca and one Cl atom. The O–Cl bond length is 1.52 Å. In the second O site, O is bonded in a bent 150 degrees geometry to one Ca and one Cl atom. The O–Cl bond length is 1.51 Å. In the third O site, O is bonded in a 3-coordinate geometry to two equivalent Ca and one Cl atom. The O–Cl bond length is 1.52 Å. In the fourth O site, O is bonded in a distorted bent 150 degrees geometry to one Ca and one Cl atom. The O–Cl bond length is 1.49 Å. In the fifth O site, O is bonded in a bent 120 degrees geometry to one Ca and one Cl atom. The O–Cl bond length is 1.51 Å. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Ca and one Cl atom. The O–Cl bond length is 1.50 Å. There are two inequivalent Cl sites. In the first Cl site, Cl is bonded in a trigonal non-coplanar geometry to three O atoms. In the second Cl site, Cl is bonded in a trigonal non-coplanar geometry to three O atoms.