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

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

Step-by-step 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`