## Atomic theory test questions

According to Rutherford, the entire mass of an atom was concentrated in a tiny positively charged nucleus and around which the extranuclear electrons moving in constant motion.

But a moving charged particle emits radiation with the loss of kinetic energy and eventually hit the nucleus.

Thus to resolve the anomalous position Bohrs model was proposed which based on several novel postulates.

#### Quantum numbers and atomic orbitals

To study the size shape and orientation of an orbital, we need to know about the four quantum numbers.

- Principal quantum number
- Azimuthal quantum number
- Magnetic quantum number
- Spin quantum number

The principal quantum number coming from Bohr’s model of an atom and it has integral values from 1 to ∞

But the azimuthal quantum number denoted by l.

l = 0, 1, 2, 3, …….. (n -1)

And the magnetic quantum number denoted by m_{l} and m_{l} has values from +l to -l.

#### MCQ questions on the atomic model

So to get the best knowledge on Bohr’s **atomic theory** to modern the structure of an atom, answer these simple questions.