Answers

2015-11-02T10:57:48+05:30
Scandium has valency of 3. But all the first transition elements show valency of 2 except scandium.
0
2015-11-02T15:28:07+05:30
Sc = 21 
1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹, 4s² 
Scandium can lose 3 electrons
So, its valency is +3.
1 5 1
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