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?

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Solution

(i) ₁₈Ar and ₂He are very stable elements, as their valance shells are completely filled. They belong to the group of inert or noble gases.

(ii) ₂₀Ca and ₄Be are the two elements that belong to group 2 of the periodic table. This is because their valency is 2 and they are electropositive.

(iii) ₈O (2,6) and ₁₆S (2,8,6) are the two elements that belong to group 16 of the periodic table.
Group number = Valence shell + 10
= 6 + 10 = 16

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By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristic?

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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?

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?