Question

the following bohr model diagrams describe the number of electrons in different electron shells. which of the four models is incorrect? a the electrons in the outermost shell are known as valance electrons.

Explanation:

Step1: Recall Bohr - model rules

The first shell can hold 2 electrons, second 8, third 8 (for small - atomic number elements), etc. Analyze each model.

Step2: Check model A

If model A violates electron - shell capacity rules, it is incorrect.

Answer:

A. Option A