Why is the entire mass of an atom concentrated on nucleus?

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Solution

Mass of an atom:
The atom consists of two parts: Nucleus and the shells.
The nucleus contains of protons and neutrons and the shells contain electrons.
The mass of electron is very less $9.1 \times 10^{- 28} g$ .
Thus, the mass of electron is considered to be negligible as compared to the mass of protons and neutrons together.
Thus, the mass of an atom is the mass of protons and neutrons in the nucleus.
Thus, the mass of an atom is concentrated on the nucleus.

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The entire mass of an atom resides in its nucleus.

Give reasons.

(a) In Rutherford’s experiment, some alpha rays collide with the gold sheet and are turned back.

(b) During ion formation, an electric charge develops on the elements.

(d) In an atom, electrons do not fall into the nucleus even though they are negatively charged.

(e) All the mass of an atom is concentrated in the nucleus.

Explain the following.

The mass of an atom is concentrated inside the nucleus of an atom.

Almost the entire mass of an atom is concentrated in

The part of an atom where nearly the entire mass of an atom is concentrated is:

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