Which property decreases from left to right across the periodic table and increases from top to bottom?

Which parameter decreases as we move from left to right along a period?

Which of the following is generally true. A: Atomic size increases from left to right across a period. B: Ionization potential increases from left to right across a period. C: Electron affinity increases on going down a group. D: Electronegativity increases on going down a group.

Explain the following a) Electronegatively of elements increase on moving from left to right in the periodic table. b) Ionisation enthalpy decrease in a group from top to bottom.

Explain the following a) Electronegatively of elements increase on moving from left to right in the periodic table. b) Ionisation enthalpy decrease in a group from top to bottom.

On moving from left to right in a period in the periodic table, the size of the atom.

On moving from left to right in a period in the periodic table, the size of the atom.