Question

All the member in a group of the periodic table have the same atomic number, valency or
atomic size?

Answer 1

Answer:

The given Statement is a false statement.

Corrected Statement:-

All the  member in a group of the periodic table have the same valency , but different atomic number and atomic size.

Explanation:

Some Trends on moving down a group in Mordern Periodic Table :-

• Valency remains the same.

• Electronegativity decreases.

• Atomic radius increases and thus atomic size increases .

• Atomic number increases.

• Metallic character increases.

• Ionization energy increases.