Question

how many valence electrons does this atom have? * p: 33 n: 42

Explanation:

Step1: Recall electron - shell rules

The first shell can hold 2 electrons, the second shell can hold 8 electrons, the third shell can hold 8 electrons for elements in the main - group, and the outermost shell electrons are valence electrons.

Step2: Determine electron distribution

The atomic number (number of protons, P = 33) is equal to the number of electrons in a neutral atom. The electron distribution is 2 in the first shell, 8 in the second shell, 18 in the third shell, and 5 in the fourth shell.

Answer:

5