Periodic Trends

Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond.

The size of atoms is measured by determining the distance between the nuclei of two bonded atoms.

Oxygen (O) is the most electronegative element.

It means that chlorine has a greater ability to attract electrons compared to hydrogen.

Barium (Ba) has the largest atomic radius in group 2.

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Atomic radius decreases from left to right across a period due to increased nuclear charge.

Atomic radius increases down a group due to the addition of energy levels.

Electronegativity increases from left to right across a period.

Electronegativity decreases down a group.