Ques: Answer the following question given this paragraph: Summary Subatomic particles of the nucleus (protons and neutrons) are called nucleons. Anuclide is an atom with a particular number of protons and neutrons. An unstable nucleus that decays spontaneously is radioactive, and its emissions are collectively called radioactivity. Isotopes that emit radiation are calledradioisotopes. Each nucleon is attracted to other nucleons by the strong nuclear force. Stable nuclei generally have even numbers of both protons and neutrons and a neutron-to-proton ratio of at least 1. Nuclei that contain magic numbers of protons and neutrons are often especially stable. Superheavy elements, with atomic numbers near 126, may even be stable enough to exist in nature. Q: What are subatomic particles of the nucleus called? Choices: - baryons - cores - isotopes - nucleons A:
Ans: nucleons

Ques: Answer the following question given this paragraph: The cations are simply named as the parent element. The sodium cation is still called "sodium. " Often, the charge would be attached for clarity, so the sodium cation might be referred to as "sodium one plus. ". Q: What are cations simply named after? Choices: - the scientist - the cell structure - the body part - the parent element A:
Ans: the parent element

Ques: Answer the following question given this paragraph: Image copyright SergiyN, 2014. Coil of copper wire, which conducts electricity well due to metallic bonds . Used under license from Shutterstock. com. Q: What gives a coil of copper wire the ability to conduct electricity well? Choices: - optical bonds - metallic electrons - metallic ions - metallic bonds A:
Ans: metallic bonds

Ques: Answer the following question given this paragraph: Occurrence, Preparation, and Compounds of Boron and Silicon Boron constitutes less than 0.001% by weight of the earth's crust. In nature, it only occurs in compounds with oxygen. Boron is widely distributed in volcanic regions as boric acid, B(OH)3, and in dry lake regions, including the desert areas of California, as borates and salts of boron oxyacids, such as borax, Na2B4O710H2O. Elemental boron is chemically inert at room temperature, reacting with only fluorine and oxygen to form boron trifluoride, BF3, and boric oxide, B2O3, respectively. At higher temperatures, boron reacts with all nonmetals, except tellurium and the noble gases, and with nearly all metals; it oxidizes to B2O3 when heated with concentrated nitric or sulfuric acid. Boron does not react with nonoxidizing acids. Many boron compounds react readily with water to give boric acid, B(OH)3 (sometimes written as H3BO3). Reduction of boric oxide with magnesium powder forms boron (9598.5% pure) as a brown, amorphous powder: B 2 O 3(s) + 3Mg(s) 2B(s) + 3MgO(s) An amorphous substance is a material that appears to be a solid, but does not have a long-range order like a true solid. Treatment with hydrochloric acid removes the magnesium oxide. Further purification of the boron begins with conversion of the impure boron into boron trichloride. The next step is to heat a mixture of boron trichloride and hydrogen: 1500 C. Q: Boron only occurs naturally in compounds with what element? Choices: - helium - nitrogen - carbon - oxygen A:
Ans:
oxygen