Why does the first ionisation energy decrease down a group?
Answer and explanation
Correct answer: D. The outer electron is further from the nucleus and more shielded
- Step 1: Each period adds a shell.
- Step 2: The outer electron is further away and shielded by inner electrons, so it is removed more easily.
Answer
The outer electron is further from the nucleus and more shielded.
Why not the others: The nuclear charge decreases: it increases down a group. The atoms have fewer electrons: they have more electrons. The outer electron is closer to the nucleus: it is further away.
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