# Structure of The Atom

## Science

### NCERT

1   What are canal rays?

##### Solution :

Canal rays are positively charged radiations. These rays consist of positively charged particles known as protons. They were discovered by Gold stein in $1886.$

2   If an atom contains one electron and one proton, will it carry any charge or not?

##### Solution :

An electron is a negatively charged particle, whereas a proton is a positively charged particle. The magnitude of their charges is equal. Therefore, an atom containing one electron and one proton will not carry any charge. Thus, it will be a neutral atom.

3   On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole.

##### Solution :

According to Thomson’s model of the atom, an atom consists of both negatively and positively charged particles. The negatively charged particles are embedded in the positively charged sphere. These negative and positive charges are equal in magnitude. Thus, by counterbalancing each other’s effect, they make an atom neutral. Thomson’s model is also known as $\textit{Plum pudding model}$ and $\textit{Water melon model.}$

4   On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom?

##### Solution :

On the basis of Rutherford's model of an atom, protons (positively-charged particles) are present in the nucleus of an atom.

5   Draw a sketch of Bohr’s model of an atom with three shells.

##### Solution :

Bohr’s model of an atom with three shells