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Which of the following statements is/are CORRECT for an oxygen atom? 1. The effective nuclear charge...

Which of the following statements is/are CORRECT for an oxygen atom?

1. The effective nuclear charge felt by a 2s electron is greater than that felt by a 1s electron.

2. The effective nuclear charges felt by 2s and 2p electrons are identical.

3. The effective nuclear charge felt by a 2p electron is less than that felt by a 2s electron.

a. 1 only

b. 2 only c.

3 only

d. 1 and 3

e. 1, 2, and 3

The correct answer is d.

I understand that 3 is correct but could someone please explain to me why 1 is also correct?

Thank you!

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