Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity — practice question

What is the reason that the first ionisation energy of phosphorus is greater than the first ionisation energy of silicon?

  • AA phosphorus atom has one more proton in its nucleus.
  • BThe atomic radius of a phosphorus atom is greater.
  • CThe outer electron in a phosphorus atom is more shielded.
  • DThe outer electron in a phosphorus atom is paired.

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