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List –I List-II
1 Isotopes P Same number of neutrons
2 Isobars Q Same isotopic number
3 Isotones R Same mass number
4 Isodiaphers S Same number of protons

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$1 - S, 2 - R, 3 - P, 4 - Q$

$1 - R, 2 - S, 3 - P, 4 - Q$

$1 - S, 2 - R, 3 - Q, 4 - P$

$1 - P, 2 - Q, 3 - R, 4 - S$

answer is A.

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Detailed Solution

	List –I		List-II
1	Isotopes	S	Same number of protons
2	Isobars	R	Same mass number
3	Isotones	P	Same number of neutrons
4	Isodiaphers	Q	Same number of A-2Z

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