Assertion: hafnium's number | /r/HasProperty | atomic
Facets:
Source sentences:
text: It has the atomic number 72.
text: Atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4.
text: Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.
text: Hafnium is a chemical element and is represented by the symbol Hf and the atomic number 72.
text: IT is a chemical element and is represented by the atomic number 72 and the chemical symbol Hf.
text: It has the atomic number 72.
text: Its atomic number is 72.
text: Atomic number, 72; atomic weight, 178.49; a silvery-white metal.
text: Its atomic number 72; atomic weight 178.49; melting point 2,220°C; boiling point 5,400°C; specific gravity 13.3; valence 4.