CSEC Chemistry · May/June 2012 · Paper 2 · Question 4(b)(i)

The properties of elements can be explained based on their electronic configuration and hence their position in the Periodic Table. The electronic configurations of four elements P, Q, R and S are: P: 2, 7; Q: 2, 8, 2; R: 2, 8, 6; S: 2, 8, 8, 2.

Outline the criteria for placing elements in the Periodic Table. Hence, state the appropriate group and period for EACH of the elements P, Q, R and S.