Question

Explain why the first ionisation energy of calcium is less positive than the second ionisation energy.

Answer 1

Answer:

Strontium is a row below calcium, meaning it has an additional electron shell.  The electrons are further away from the nucleus in strontium than calcium, so the attraction is weaker and so the first ionisation energy is less.

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Explanation:

Answer 2

Answer:

Strontium is a row below calcium, meaning it has an additional electron shell. The electrons are further away from the nucleus in strontium than calcium, so the attraction is weaker and so the first ionisation energy is less.