Multiple choice

The second ionisation energy is always greater than the first. This is because

  1. the effective nuclear charge increases

  2. the number of shells decrease

  3. the number of protons increase

  4. all are correct
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A Correct answer
Explanation

After the first ionisation, effective nuclear charge increases and the remaining electrons are more tightly held. Hence the energyrequired for the second ionisation will be more

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