Question

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Answer 1

Explanation:

1) When an atom can accept two electron in its outermost shell its valency will -2, not +2, because gain of electron is reduction.

2) The closest shell to the nucleus is called the "1 shell" (also called the "K shell"), followed by the "2 shell" (or "L shell"), then the "3 shell" (or "M shell"), and so on farther and farther from the nucleus.

3) Aluminum oxide has a chemical formula Al2O3. It is amphoteric in nature, and is used in various chemical, industrial and commercial applications. It is considered an indirect additive used in food contact substances by the FDA.

4) Nucleon is the collective term for protons and neutrons. Nucleons are the particles found in the nucleus of atoms

5) Chlorine is a green yellow gas with a very pungent odour that is twice as dense as air. It is a chemical element belongs to the halogen group with the symbol Cl.

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