find the answer from the given picture
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Lithium-
atomic no.- 3
Oxygen-
electronic configuration-2,6.
Group no.- 16.
Period no.-2.
Argon-
Electonic configuration-2,8,8.
Group no.-18.
Period no. -3
Calcuium- atomic no.-20.
Group no. -2.
Period no. -4
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