CH-636
Periodic trends
Chemistry · Secondary 3 · Medium · Periodic trends
Which statement best explains why magnesium has a higher first ionisation energy than sodium?
- Magnesium has fewer electron shells than sodium, so shielding is greater.
- Magnesium has more protons and a smaller atomic radius, so attraction for the outer electron is stronger.
- Magnesium has more electron shells, so its outer electron is further away.
- Magnesium has a full outer shell, so it does not lose electrons.
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