railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

एका मूलद्रव्याचा अणुअंक 17 आणि वस्तुमानांक 36 असेल, तर त्यातील न्यूट्रॉनची संख्या किती असेल?

1
17
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36
3
19
4
18
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