Question

Nuclear charge increases both in a period and group. But, effective nuclear charge increases in a period and decreases in a group. Identify the correct reverse trend.

• A. Reverse trend of atomic size
• B. Role of screening effect
• C. Reverse trend of metallic character
• D. Role of inter electronic repulsions

Answer 1

The correct option is A Reverse trend of atomic size

Effective nuclear charge is the attractive positive charge of nuclear protons acting on valence electrons. The periodic table tendency for effective nuclear charge:

1. Increase across a period
2. Decrease down a group

Hence the reverse trend would be the Atomic mass which decrease down the period and increase down the group