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

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Solution

The mass of an atom is due to the presence of protons and neutrons as electrons have negligible atomic mass.
Since protons and neutrons are present inside the nucleus, therefore the mass of an atom is concentrated inside the nucleus of an atom.

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Explain the following :

(a) Electrovalent compounds conduct electricity in molten or aqueous state.

(b) Electrovalent compounds have a high melting point and boiling point while covalent compounds have low melting and boiling points.

(d) Atoms combine by transfer and sharing of electrons (s).

(e) An element has atoms with different mass number.

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

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