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Which of the following is/are correct ? ...

Which of the following is/are correct ?
(I) Density of all the nuclei is same.
(II) Heavy elements exhibit radioactivity.
(III) Amongst alpha, beta and gamma rays, `alpha`-particle has minimum penetrating power.
(IV) Isobars are the atoms of same elements having the different mass number.

A

I, II and III only

B

I, II and IV only

C

I and III only

D

I and II only

Text Solution

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The correct Answer is:
A
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