Name two ions which are iso-electronic with Ar (Z = 18).

The bond length of HCl bond is 136 pm. Covalent radius of hydrogen atom is 37 pm. What is the covalent radius of chlorine atom?

How is the atomic radius of an element actually expressed?

An element A with atomic number 112 has recently been discovered. Predict its electronic configuration and suggest the group in which this element be placed.

What is the correlation between atomic size and ionisation enthalpy?

Write the atomic number of the element present in the third period and seventeenth group of the periodic table. 

Arrange the following in decreasing order of ionic size:

Mg²⁺,  O^2-,  Na⁺, F^-,  N^3-.

Arrange the following in increasing order of size: Cl^-, S^2-, Ca²⁺, Ar

Which radius, vander Waal's or covalent, is larger for an atom?

Arrange,  l, l^-, l⁺ in increasing order of size.