From the following elements : 4Be; 9F; 19K; 20Ca (i) Select the element having one electron in the outermost shell. (ii) two elements of the same group.
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The valence electron of 
= 2.
The valence electron of
= 7
The valence electron of
= 1
The valence electron of
=2
The two elements of the same group is Be and Ca.
Please mark it brainiest answer......................................................
The valence electron of
The valence electron of
The valence electron of
The two elements of the same group is Be and Ca.
Please mark it brainiest answer......................................................
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