Can someone me on #12? i’m confused on what’s it asking

Explanation:

The given valence electronic configurations is as follows.

In this configuration, completely filled s-orbital and electrons are enters into the p-bolck therefore, it is p-block configuration.

In this configuration, electrons are enters into the s-bolck therefore, it is s-block configuration.

In this configuration, completely filled s-orbital and electrons are enters into the d-bolck therefore, it is d-block configuration.

In this configuration, completely filled s-orbital and electrons are enters into the p-bolck therefore, it is p-block configuration.

1 a

2 d

3 a

4 c

explanation: