Question

how many electrons does hydrogen have in its valence shell when it is full? (1 point)
one
seven
eight
two

Explanation:

Step1: Valence shell electron rule

For the first energy level (where hydrogen's electron is), the maximum number of electrons is \(2\). Hydrogen has its valence electron in the first shell. When it's full, it has \(2\) electrons. This follows the \(2n^{2}\) rule (\(n = 1\) for the first shell, \(2\times1^{2}=2\)).

Answer:

two