निम्न तत्वों में से किसमें – McqOptions

MCQOPTIONS

1.	निम्न तत्वों में से किसमें न्यूट्रॉन नहीं होता है -
A.	ऑक्सीजन
B.	नाइट्रोजन
C.	हाइड्रोजन
D.	ताँबा
Answer» D. ताँबा

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