General Science Chemistry Basic Concepts of Chemistry

ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟି ଏକ ଆଇସୋଟୋପ୍ ପ୍ରତିନିଧିତ୍ୱ କରେ?

1
39 K 19
2
23 Na 11
3
14 N 7
4
14 C 6

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