Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
(i) 18Ar and 2He are very stable elements as they are Noble gases.
(ii) 20Ca and 4Be are present in group 2 of the periodic table as the no. of valence electrons in each is 2.
(iii) 8O and 16S are present in group 16 of the periodic table as the no. of valence electrons in each is 6.
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