Chemistry, asked by thegamer7332, 7 months ago

Q.The elements which are cited as an example to
prove the validity of mendeleev's periodic law are:-
(1) H, He
(2) Ga, Sc
(3) Co, Ni
(4) Zr, Hf

Answers

Answered by anjalikl

3

Answer:

3 is the answer

hope it helps

please mark me as the brainliest

Explanation:

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