SSC SSC GD Constable 2025 Mock Test Series General Science Chemistry Periodic Table

ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟିର ଅବିଭକ୍ତ ଇଲେକ୍ଟ୍ରନ୍ଗୁଡ଼ିକର ସର୍ବାଧିକ ସଂଖ୍ୟା ଥାଏ ? ଅ 

1
Zn 2+
2
Fe 2+
3
Ni 2+
4
Cu +
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