Question

Elements in the same group have similar ____

Answer 1

Electronic configuration:

1. The electron configuration of an element signifies the distribution of electrons in its atomic orbitals
2. Element of the same group has an identical electronic configuration because they have the same number of valence electrons.
3. For example, the electronic configuration of Sodium $\left(\mathrm{Na}\right)$ is shown below:

$$\begin{gathered} \mathrm{K}\mathrm{L}\mathrm{M} \\ {\mathrm{Na}}_{11}\to 2,8,1 \end{gathered}$$

Therefore, elements in the same group have similar electronic configurations.