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Structure of an Atom

Which of the ...

Question

Which of the following particles exists in atomic nucleus ?

A

Protons and electrons

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B

Protons and neutrons

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C

Positrons and neutrons

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D

Neutrons and electrons

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E

Protons, neutrons and electrons

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Solution

The correct option is B Protons and neutrons
The particles existing in the nucleus are known as nucleons. Only protons and neutrons exist inside the atomic nucleus and sum of protons and neutrons is known as the mass number of the atom.

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Q. A radioactive nucleus (initial mass number A and atomic number Z) emits 3

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- particles and 2 positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

Q. A radio active nucleus (initial mass number A and atomic number Z emits 4

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During Rutherford's α-particle scattering experiment, he concluded that:

(i) electrons have a negative charge.
(ii) the mass and positive charge of the atom is concentrated in the nucleus.
(iii) neutron exists in the nucleus.
(iv) most of the space in an atom is empty.

Q. Assertion (A) : Nucleus of the atom does not contain electrons, yet it emits

β -

particles in the form of electrons.
Reason (R) : In the nucleus, protons and neutrons exchange mesons frequently.

Q. Question 8
Rutherford's a-particle scattering experiment showed that

(i) electrons have negative charge.
(ii) the mass and positive charge of the atom is concentrated in the nucleus.
(iii) neutron exists in the nucleus.
(iv) most of the space in atom is empty.
Which of the above statements are correct?

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)

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