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Sub-Atomic Particles

The phenomeno...

Question

The phenomenon of radioactivity is associated with :

A

decay of nucleus

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B

fussion of nucleus

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C

emission of electrons or protons

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D

rearrangement in the extra nuclear electron

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Solution

The correct option is A decay of nucleus
The phenomenon of radioactivity is associated with decay of nucleus.
Thus, radioactivity is a nuclear property shown by atoms with unstable nucleus like U, Th, Ra.

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Similar questions

Q. When a nucleus in radioactive atom undergoes radioactive decay, the electronic energy levels of the atom:

Q. With reference to radioactive decay, consider the following statements:

Which of the statements given above is/are correct?

1 only
1 and 3 only
1,2 and 3
2 and 3 only

Q. Is Radioactivity a nuclear phenomenon?

Q. Assertion :Nuclear-fission is a chain reaction. Reason: Extra electrons formed in the intermediate steps further attack the nuclei.

The nuclear charge actually experienced by an electron is termed as the effective nuclear charge. The effective nuclear charge Z* actually depends on the type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is

s > p > d > f

(for the same value of

n

The phenomenon in which penultimate shell electrons act as screen or shield in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. The penultimate shell electrons repel the valence shell electron to keep them loosely held with the nucleus. It is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy.

Which of the following is not concerned with effective nuclear charge?

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