Question

Which of the following statements regarding the variation of atomic radii in the periodic table is not true?

• A. In a group, there is continuous increase in size with increase in atomic number.
• B. In 4f-series, there is a continuous decrease in size with increase in atomic number,
• C. The size of inert gases is larger than halogens.
• D. In 3rd period, the size of atoms increases with increase in atomic number.

Answer 1

The correct option is D In 3rd period, the size of atoms increases with increase in atomic number.

In the 3rd period, the size of atoms decreases with increase in atomic number.

Elements of third period	$Na$	$Mg$	$Al$	$Si$	$P$	$S$	$Cl$
Atomic radius (ppm)	186	160	143	117	110	104	99