1. Atomic Structure

1.4 Ionisation Energy MCQ Practice

Question 1

Which factor causes helium to have a higher first ionisation energy than hydrogen?

A In the 1s orbital in helium, electrons are paired.

B The lowest energy level in helium is filled.

C The nuclear charge in helium is higher than in hydrogen.

D There is less shielding of the outer shell in helium.

Question 2

Z is a compound of two elements, X and Y.

Element X shows a very large increase between its 5th and 6th ionisation energies. It has the second largest 1st ionisation energy in its group.

Element Y shows a very large increase between its 6th and 7th ionisation energies. It has the largest 1st ionisation energy in its group.

What is compound Z?

A NO₂

B PCl₅

C P₄O₁₀

D SF₆

Question 3

The second ionisation energy of oxygen is greater than the second ionisation energy of fluorine. Which factor explains this difference?

A The atomic radius of an oxygen atom is smaller than that of fluorine.

B The covalent bond in a fluorine molecule is weaker than the bond in an oxygen molecule.

C A spin-paired electron is removed from fluorine but not from oxygen.

D Fluorine has more electrons in total than oxygen. This causes a greater shielding of the nuclear attraction in fluorine.

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