खालीलपैकी कोणती समन्यूट्रॉन्सची जोडी आहे?

1
\(^{23}_{11}Na, ^{23}_{12}Mg\)
2
\(^{23}_{11}Na, ^{24}_{12}Mg\)
3
\(^{24}_{11}Na, ^{24}_{12}Mg\)
4
\(^{24}_{11}Na, ^{23}_{12}Mg\)

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