Question

How does the electron configuration of elements within the same group compare? (A.) They all have their valence electrons in the same energy level. ( B) They all have their valence electrons in the same type of subshell. (C) They all have their valence electrons in a p suborbital. ( D) They all have their valence electrons in the 3rd energy level.

Answer 1

Answer:

B.They all have their valence electrons in the same type of subshell

Explanation:

• The electron configurations of elements in the same group (column) of the periodic table have them in the same type of subshell.
• But the subshells may be of different shells. Thus , the energies of them need not be the same.
• For example , The Alkalai Metals are found in the first column of the periodic table Group IA. This set of elements all have valence electrons in only the '$s$' orbital and because they are in the first column they all have $s^{1}$ configuration. i.e,

1. H $1s^1$
2. Li $1s^2 2s^1$
3. Na $1s^2 2s^2 2p^6 3s^1$
4. K $1s^2 2s^2 2p^6 3s^2 3p^64s^1$