the atomic number of element X is 20and to which group the period of modern period table x belongs to . state it's valency . and write down the EC
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Ec 2,8,8,2
Period: 4
Group: 2
Valency: 2
lokesh30121968:
isn't calcium 20
ec should be 2 ,8,,8,2
Yeah
then tf u wrote 2,8,8
ya i corrected it
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