Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?

(a) group 8
(b) group 2
(c) group 18
(d) group 10

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Solution

(c) Group 18.

The element with an electronic configuration of (2, 8) belongs to group 18 (noble or inert gases) of the periodic table, as the elements in this group have their valence shell completely filled with electrons.
Group number = valence shell + 10
= 8+10 = 18.

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