Exercise (3.1 Classification of Elements)

1.

For the above elements (T, U, X, Y and Z), identify and write the
(a) group
(b) period
(c) block

2. If X²⁺ ion has 10 electrons, determine the group, period and block for the X atom.

Answer
1. T: Group 18, Period 5, p-block,
    U: Group 5: Period 6, d-block
    X: Group 1: Period 3, s-block
    Y: Group 13, Period 4, p-block
    Z: Group 17, Period 3, p-block
2. Group 2, Period 3, s-block