The electron affinities, i.e., the energy necessary to add an extra electron to

Question

The electron affinities, i.e., the energy necessary to add an extra electron to an element, for the period 2 elements are listed in the following table:

A rationale for the following observations:

is based on

A. The electron configurations of the period 2 elements.

B. The size of the period 2 elements

C. The ionization energies of the period 2 elements

D. The negative values of Li, B, C, and F

E. The positive values of Be, N, and Ne

Element in kJ/atom Li -9.97 x 10-23 Be >0 B -4.49 x 10-23 C -2.03 x 10-22 N >0 O -2.34 x 10-22 F -5.45 x 10-22 Ne >0

Explanation / Answer

1) Be has fully filled sub shell configuration, N has half filled configuration and Ne has octet configuration. So they can require energy to accpt the elctron.

2) Li will get fullfilled sub shell configuration 1s2 2s2 after gaing electron and B get only 1s2 2s2 2p2 configuration after gaining elctron hence LI releases more energy compare to B.

the given all based on

A. The electron configurations of the period 2 elements.

B. The size of the period 2 elements

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