Question

Which element of the following groups of elements has smallest ionisation energy. Justify your answer.
a) Ca or Be
b) Ca or K
c) Cl or I
d) Be, B, C

Answer 1

(d) because of less reactive nature...

Answer 2

yes , option no . ( D ) . is right answer because the ionization energy decreases from top to bottom in group of periodic table . and in period of periodic table is increases from left to right . so option no. D is right.