engineering recuitment BARC Stipendiary Trainee Category I 2023 Mock Test General Science Chemistry Classification of Elements and Periodicity in Properties

পর্যায় সারণীতে নীচের কোনটি সবচেয়ে বেশি তড়িৎঋণাত্মক মৌল?

1
N
2
Cl
3
F
4
O
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