of 1s2, 2s2, 2p6,3s1.The two electrons fill the 1stsub shell, 8 electrons fill the 2nd and 1 electron fill the outermost shell due to octet rule. Due to the presence of single electron on the outermost shell, Na is placed on the Group 1 with Li. 3. Calcium: Ca Calcium is places in group 2. It is called an alkaline earth metal. Due to the octet rule it has an electron configuration of 1s2, 2s2,2p6, 3s2, 3p6 , 4s2. Because of this rule two electrons are placed on the outermost shell therefore calcium…
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