# Question #fc19d

##### 1 Answer

The Bohr model depicts the hydrogen atom as a small, positively charged nucleus around which an electron travels in various circular orbits at specific energy levels.

The postulates of the Bohr Theory are:

a. The electron travels about the nucleus in circular orbits.

b. The only allowed orbits have specified energy levels and are at a discrete set of distances from the nucleus.

c. Electrons can gain or lose energy only by jumping from one allowed orbit to another, absorbing or emitting electromagnetic radiation with a frequency *f* according to the equation: *h* is Planck’s constant.

d. The angular momentum *L* of the electron must be an integer multiple of a fixed quantity:

where *n* = 1, 2, 3, … is called the *quantum number*. It is this *n* that determines the size and the energy level of the various orbits.