find the group no of the element having atomic no. 21
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1
Answer:
Atomic number 21 is Scandium and it is in the group Transition metals (3-12) group
Answered by
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Explanation:
Scandium
3rd group
1s2 2s2 2p6 3s2 3p6 4s2 3d1
no. of valence electron is 1
belongs to 3rd group
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