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The number of protons, neutrons and elec...

The number of protons, neutrons and electrons in four elements 1, 2, 3 and 4 are as follows:
(1) p = 6, n = 6, e = 6
(2) p = 6, n = 7, e = 6
(3) p = 18, n = 22, e = 18
(4) p = 19, n = 21, e = 19
In these

A

elements I and II are isotopes and elements III and IV are isobars

B

elements I and II are isotopes but elements III and IV are not isobars

C

elements I and II are isobars and element III and IV are isotopes

D

elements I and II are isobars but elements III and IV are not isotopes.

Text Solution

Verified by Experts

The correct Answer is:
A
Isotopes are elements having same atomic number (number of protons) but different mass number. Isobars are elements having same mass number but different atomic number.
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