1.

Give scientific reason:All the mass of an atom is concentrated in the nucleus.

Answer»

1. The nucleus of an atom contains protons and neutrons. 

2. The electrons revolve around the nucleus. 

3. The mass of an electron is negligible compared to that of a proton or a neutron. 

4. Hence, the mass of an atom depends mainly on the number of protons and neutrons. Therefore, practically all the mass of an atom is concentrated in the nucleus.



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