8. In going down a column in the periodic table, the a. decreases because the va

Question

8. In going down a column in the periodic table, the a. decreases because the valence electrons are further from the nucleus. b. increases because the electron repulsion increases. c. increases because the nuclear charge increases. d. increases because the ionization potential increases. e. decreases because the atomic number increases. 9. A covalent bond results when a. atoms have outer electrons with the same principal quantum number. b. atoms pool their electrons to form a "sea" of electrons. c. an atom has 8 valence electrons. d. electrons are transferred from one atom to another atom. e. electrons are shared between a pair of atoms. 10. Identify the molecule or ion that contains a polar covalent bond d. H2 e. CN b.

Explanation / Answer

8. A

Electronegativity decrease down the group in periodic table

9. E

Covalent bond is formed by sharing of electrons

10. E

Polar covalent bond is formed by two atom of different electronegativity.

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