Question

The element with smallest size in the $4^{th}$ period is:

• A. chlorine
• B. iodine
• C. fluorine
• D. bromine

Answer 1

The correct option is D bromine

In a period the outer electrons lie in the same valence shell.As the atomic number increases effective nuclear charge increases so there is an increased attraction of electrons to the nucleus so in a period $Li$ has the largest size.