write the name of element upto 50 with electrone no. and valency
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for valencies :
group 1 val +1
group 2 val +2
grp 3 val +3
grp 4 val +4,-4
grp 5 val -3
grp 6 val -2
grp 7 val -1
grp 8 val 0
group 1 val +1
group 2 val +2
grp 3 val +3
grp 4 val +4,-4
grp 5 val -3
grp 6 val -2
grp 7 val -1
grp 8 val 0
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