Question

Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have?

Answer 1

Potassium has 1 valence electron

Answer 2

Answer: Potassium has 1 valence electron.

Explanation:

Valence electrons are defined as the electrons which are present in the last shell of the atom. They are identified by the electronic configuration of atom.

Sodium is the 11th element of the periodic table. It belongs to Group 1 and period 3. Electronic configuration of this element is $1s^22s^22p^63s^1$

Sodium has 1 electron in the last shell. Thus, it has 1 valence electron.

Potassium is the 19th element of the periodic table. It belongs to Group 1 and period 4. Electronic configuration of this element is $1s^22s^22p^63s^23p^64s^1$

Potassium has 1 electron in the last shell.

Thus, it has 1 valence electron.