Ionisation Energy

Define the first ionisation energy of an element.

Which equation correctly represents the second ionisation energy of magnesium?

Which factor does NOT cause a decrease in the first ionisation energy of an element?

Explain why the first ionisation energy of aluminium is lower than that of magnesium.

The first ionisation energy of sulfur is lower than that of phosphorus. What is the correct explanation?

The first ionisation energies (kJ mol⁻¹) of four consecutive Group 1 elements are: 520, 419, 403, 376. Which statement correctly explains this trend?

An element X in Period 3 has the following successive ionisation energies (kJ mol⁻¹): 738, 1451, 7733, 10540, 13630, 17995, 21703. To which group does X belong?

The successive ionisation energies of an element show jumps after the 3rd and the 11th electrons removed. What is the electronic configuration of this element?

Why does each successive ionisation energy of a given element have a higher value than the previous one?

A space probe samples a gas cloud and identifies an unknown Period 3 element Q. Its first five ionisation energies (kJ mol⁻¹) are: 1012, 1907, 2914, 4964, 6274, then jumps to 21270 for IE₆. What is element Q?

Which equation correctly represents the third ionisation energy of aluminium?

A student claims that the first ionisation energy of neon should be lower than that of fluorine because neon has a greater number of electron-electron repulsions. Why is this claim incorrect?

The ratio IE₂/IE₁ for sodium is approximately 9.2, whereas for magnesium it is approximately 1.9. What does this difference reveal?