Nucleus: Common Terms

Q.

An atom has 12 protons, 12 electrons and 12 neutrons. Its mass number is _______ and atomic number is ________.

Q.

The atom of an element is made up of $11$protons, $12$neutrons, and $11$electrons. What is its atomic number and mass number?

Q. Protons and neutrons are collectively called as nucleons.

1. True
2. False

Q.

The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is $r_0$. The distance of the closest approach when the alpha particle is fired at the same nucleus with kinetic energy 2K will be

1. $2r_0$

2. $4r_0$

3. $\frac{r_0}{2}$

4. $\frac{r_0}{4}$