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.

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

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

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

Q. The number of protons present inside the nucleus of an atom is called atomic number.

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

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.

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

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.