Question

How many valence electrons does H have?

Answer 1

Hydrogen has $1$ valence electron.

Explanation:

Hydrogen is in the first row of the Periodic Table. Elements in the first row are filling their $1s$ orbitals.

Since hydrogen is the first element, its electron configuration is $1s^1$. It has only one electron in its valence shell.

Valence electrons are the outermost electrons or electrons in the largest energy level.

Hydrogen has only one electron, so that electron is a valence electron.