Question

In third row of periodic table, the atomic radii from $Na$ to $Cl$

• A. Continuously decreases
• B. Continuously increases
• C. Remains constant
• D. Increases but not continuously

Answer 1

The correct option is A Continuously decreases

The atomic radii from $Na$ to $Cl$ decreases since the number of protons increases from left to right hence nuclear charge increases. The attraction between the positive nucleus and negative electrons in the outer shell increases, so the atomic radius decreases.