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).

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.