Question

Which one of the following has highest ionization energy A;O B;c-1 C;O-1 D;Cion energy A;O B;c-1 C;O-1 D;C

Answer 1

Explanation:

ANSWER

(1) Be has completely filled stable v configuration i.e. 2s

2

while in Be

+

because of positive charge, the removal of electron requires much higher energy. So, ionisation energy of Be

+

is greater than Be.

(3) Across the period, atomic size decreases and nuclear increases and thus valence shell electron(s) is/are tightly held by nucleus. So, ionisation energy is greater than Be.