Question

What is the effective nuclear charge (ENC) experienced by a 1s and a 2p electron, respectively, in the F-1 anion?

a) 7 and 7
b) 9 and 7
c) 7 and 9
d) 9 and 9

Answer 1

The effective nuclear charge experienced by a 1s and a 2p electron in the F-1 anion is 7 and 9 respectively.

Step-by-step explanation:

The effective nuclear charge (ENC) experienced by an electron can be determined by considering the shielding effect of inner electrons. In the case of the F-1 anion, which has an extra electron compared to a neutral fluorine atom, the 1s and 2p electrons will experience different ENC values.

The 1s electron is located closest to the nucleus and is shielded by two inner shell electrons. Therefore, the ENC experienced by the 1s electron is 7.

The 2p electron is further from the nucleus and is shielded by only two inner shell electrons and the 1s electron. Therefore, the ENC experienced by the 2p electron is 9.

So, the correct answer is (c) 7 and 9.