Question

Q 98 Which of the following statement is correct for the ionization energy of
elements?
1. It decreases as atomic radii increase
II. It is inversely proportional to the principal quantum number
III. It is directly proportional to the principal quantum number
Ops: A. 1 and 3
B.
Only 2
C. Only 1
D.
1 and 2​

Answer 1

Answer:

A) 1and 3 hope it helps thanks

Answer 2

The answer is D. 1 and 2

Explanation:

Ionization energy is the amount of energy required to remove an electron from an isolated gaseous atom.

• When size decreases, this energy is found to increase, because there is high attraction from the nucleus on the outermost electron, hence difficult to remove it. Thus, the statement I is correct.
• When the principal quantum number increases, generally it is observed that size increases. Thus, less effective nuclear charge, hence, ionization energy decreases. So we can say that ionization energy would be inversely proportional to the principal quantum number.

Hence, statement II would be correct, but statement III would be incorrect.

So, the answer is D. 1 and 2.