Question

The first ionization potential (kJ/mol) of Be and B
respectively are
(1) 899, 801
(2) 899, 899
(3) 801, 801
(4) 801, 899
​

Answer 1

Ionization Energy is the minimum energy required to remove the outermost electron from a gaseous neutral atom to form a cation. The position of A will be above B in a group. Because Ionization energy decreases down the group. In period the position of A will be right side of B. Because Ionization energy increases from left to right in a period.