Question

Atomic radii from left to right across a row of the periodic table:

• A. increases
• B. decreases
• C. remain constant
• D. none of these

Answer 1

Answer: (B)

decreases

In a period atomic number increases as we move from left to right but the outer most shell remains same. Hence its only the number off protons increasing in the nucleus as we from left to right, the affect of nucleus increases on outer most shell hence atomic size decreases in a period. Hence, radii decrease as we move from left to right in a period.