F5 Chem

The electronic arrangement of three elements
are shown in the table below:
Element..............Electronic arrangement
.....w................. 2, 3
.....Y...................2, 5
.....Z....................2, 8, 7
(W, Y and Z are not chemical symbols)

Z can react with W and Y to give molecules A
and B respectively.

a) Draw electron diagrams ( showing electrons
in the outermost electron shells only) for A and
B.

b) Give the molecular formulae of A and B

c) Which of them, A and B, does not follow the octet rule? Explain your answer.