1) The electron energy levels of a certain element can be represented by:

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s².

i) What is the atomic number of the element?

ii) In which group of the periodic Table should the element be?

iii) What will be the charge on the ion of the element?

2) Predict the polarity of each the following molecules or ions with the VSEPR structures (Show the seps )

(a) PO₃³

(b) NH₄ ⁺

(c) CH₃CH₂OH