Atoms of elements X, Y and Z have 16, 17 and 19 electrons, respectively. Atoms of argon have 18 electrons.

a. Determine the formulae of the compounds formed by the combination of the atoms of the elements:

(i) X and Z

(ii) Y and Z

(iii) X with itself.

b. In each of the cases shown in a(i)–(iii) above, name the type of chemical bond formed.

c. Give two properties you would expect to be shown by the compounds formed in a(ii) and a(iii).