CAPE Chemistry Unit 1 Practice Questions - CAPE Chemistry Unit 1 (Caribbean Examinations Council, CXC) Exam

Which statement best explains why the first ionisation energy of aluminium is lower than that of magnesium?

Aluminium has a smaller nuclear charge than magnesium The outer electron removed from aluminium is in a 3p orbital, which is higher in energy than the 3s orbital of magnesium Aluminium has a complete outer shell Magnesium has more shielding than aluminium

Correct Answer:

The outer electron removed from aluminium is in a 3p orbital, which is higher in energy than the 3s orbital of magnesium

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