identify groups and period of element na,N,sc
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Na - group 1 and period 3
N - group 15 and period 3
Sc - group 13 and period 4..
rajnishkumar18:
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yrr ek bahut aasan tarika hai
dekho jaise Na element me last shell me 1 electron hota h to ye 1st group se belong karega
electric configuration of Na — 2,8,1
in this no. of shells = 3, so it belongs to period no. 3
no. of shell decides = period of an element
no. of electrons in the last shell decides the group of an element
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