Question

On moving from left to right in the third period of the periodic table:

• A. Atomic number and atomic size increases
• B. Atomic number and atomic size decreases
• C. Atomic number increases and atomic size decreases
• D. None of the above

Hint:

In periods of the periodic table: - Atomic size decreases as the effective nuclear charge increases (due to more protons), pulling electrons closer to the nucleus.

Answer 1

The Correct Option is C

Step 1: Understand periodic trends. - As you move from left to right across a period in the periodic table: - The
atomic number increases because protons are being added to the nucleus. - The
atomic size (radius) decreases because the increasing nuclear charge attracts electrons more strongly, pulling them closer to the nucleus.
Step 2: Conclude. Thus, on moving from left to right in the third period, the
atomic number increases and
atomic size decreases.