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

নীচের কোনটিতে সর্বোচ্চ সংখ্যক জোড়াবিহীন ইলেকট্রন আছে?

1
Zn2+
2
Fe2+
3
Ni2+
4
Cu+
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