Question

The atomic radii increase over a period from left to right.

• A. True
• B. False

Answer 1

The correct option is B False

Atomic radius trend in the periodic table

1. The atomic radius of atoms generally decreases from left to right across a period.
2. This is because across a period valence electrons are added as we move from left to right.
3. This causes the net charge difference in an atom, and as a result, the electrons are pulled more tightly, leading to the shrinking of the radius as we move across a period.
4. The atomic radius of atoms generally increases from top to bottom within a group.
5. As the atomic number increases down a group, there is an increase in the positive nuclear charge.

Therefore, atomic radius decrease from left to right, hence the above statement is false.