Write the name and the symbol of the element that fits each of the following descriptions: a) the alkaline earth metal in the sixth period. b) the metalloid in the third period. c) the nonmetal in group IVA. d) the halogen that is liquid at room temperature. e) the group-VIIIB transition metal with properties similar to Ru. f) the third-period element that exists as diatomic molecule.

Explanation:

a) Barium

b) The metalloid in third period is Silicon

c) Group 4A (or IVA) of the periodic table includes the nonmetal carbon (C)

d) At this temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine and astatine are solids.

e) osmium

f) chlorine (Cl, element 17) are a gas at room temperature, and is found as diatomic molecule (Cl2).

increased stability in the completion of fluorine's outer shell.

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