Theory Questions – Periodicity and Periodic Table II

1. (a) The ionization energies of Lithium and Potassium are 5.4 and 4.3 respectively; predict the ionization energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More of Sodium.

(b) Explain why the second ionization energy of Sodium is much bigger than the first, whereas the magnitude of the difference between the first and second ionization energy of magnesium is not much

2. (a) Define the following

• Ionization Energy
• Atomic Radius
• Electronegativity

(b) Discuss their trend across the period and down the group in the periodic table.

3. (a) List three  periodic properties of elements that generally  increase across the period of the periodic table.

(b) Arrange the following elements in order of decreasing electronegativity ₁₆S, ₉F, ₁₇Cl.