Bohr Model

Cliff Notes

I. Shell Model

A. Niels Bohr (1886-1962) discovered that an electron has more energy when it's further from the

nucleus, and less when it's closer

B. Bohr atomic shell model (or just shell model) shows how electrons are arranged outside the nucleus

according to their energy

C. *HINT: The number of electrons on each shell level corresponds to the number of elements in each period (for example, the first period has 2 elements, the second period has 8 elements, third period has 8 elements, etc.)