Question

how to find valency of 21 to 30 elements​

Answer 1

YOUR ANS =

FIRST UPON YOU DRAW ELECTRONIC CONFIGURATION OF ALL THESE ELEMENT OF 21 TO 30

AND THEN ,

which number is in the last period of the table of configuration

called as valance electron

the is your valency .....

suppose -

scandium ( 21 ).

its configuration is ( 2 ,8,8,3 )

therefore it's valency is 3

hope it helps you

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Answer 2

Answer:

you have to look for the electrons in the outermost shell if the no is from 1to4 same will be the valency if it is from 5to7 8-(that no )gives you the valency if no is 8 it is a noble gas valency is 0