state the electronic configuration of element with element and atomic no. 7 atomic no. 18 , atomic no. 20, atomic no. 9 with elements
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7 attomicity is in cell called elements
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see down
Explanation:
ATOMIC NO. 7 - NITROGEN - 2,5
ATOMIC NO. 18 - Argon - 2,8,8
ATOMIC NO. 20 - Calcium - 2,8,8,2
ATOMIC NO. 9 - Fluorine - 2,8,1
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