Question

(i) 1s2 2s2 2p6 3s1 (ii) 1s2 2s2 2p6 3s2 (iii) 1s2 2s2 2p6 3s2 3p1 (iv) 1s2 2s2 2p6 3s2 3p4 (v) 1s2 2s2 2p6 3s2 3p5 The electron configuration of the atom that is expected to have a positive electron affinity is ________.

Answer 1

ii

Step-by-step explanation:

While electron affinity increases as you go up and to the right across the periodic table, electron affinity is most likely positive when there is a fully filled subshell.

In 1, the last subshell is 3s1, which isn't filled.

In 3, the last subshell is 3p1, which isn't filled.

In 4, the last subshell is 3p4, which isn't filled.

And in 5, the last subshell is 3p5, which isn't filled either.

However, in 2, the last subshell, 3s2, is completely filled. Therefore, it is most likely to have a positive electron affinity.

Answer 2

V

Step-by-step explanation:

Firstly let’s list the names of the atoms

1. Sodium

2. Magnesium

3. Aluminum

4. Oxygen

5.Chlorine

Generally, anions have greater electron affinity than cations. Hence, they have more positive values for this electron affinity. This means that the higher the electron affinity, the greater its positive value

Electron affinity increases across a period. Thus, it is expected that chlorine has the highest value