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Explain why Magnesium has a greater second ionisation energy than strontium

Magnesium is a smaller atom with a smaller radius than strontium, this means the electron has a greater attraction to the nucleus. Also as strontium has more orbitals the electron has more shielding from the nucleus from the lower orbitals.

Answered by Kelvin W. • Chemistry tutor

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Explain why Magnesium has a greater second ionisation energy than strontium

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