This question is about the periodic table.
Sodium and potassium are in Group 1 of the periodic table.
Give one similarity and one difference between the electronic structures of sodium and potassium.
Similarity:
Difference:

**Similarity:** Sodium (Na) and potassium (K) are both in Group 1. The group number of an element in the periodic table corresponds to the number of electrons in its outermost shell. Therefore, both sodium and potassium have one electron in their outer shell. **Difference:** Potassium is in Period 4, while sodium is in Period 3. The period number corresponds to the number of occupied electron shells. This means potassium has four electron shells, whereas sodium has only three. (Na: 2,8,1; K: 2,8,8,1).