an element having valencies 2,4 and 6
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no. 2 /symbol He/ element Helium/ valence 0
no.4/ symbol Be/ element Beryllium/ valence 2
no. 6/ symbol C/ element Carbon/ valence 4,3,2,1,-1,-2,-4
no.4/ symbol Be/ element Beryllium/ valence 2
no. 6/ symbol C/ element Carbon/ valence 4,3,2,1,-1,-2,-4
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2 = Helium
4 = Beryllium
6 =Carbon
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