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Introduction to Noble Gases

An element 'X...

Question

An element 'X' belongs to $3^{r d}$ period and group 17 of the periodic table. State its (i) electronic configuration, (ii) valency. Justify your answer with reasoning.

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Solution

(i) Since element X' belongs to 3rd period, it means that the element X has three shells. Also, it belongs to group 17 which means that it has 7 valence electrons as valence electrons $= 17 - 10 = 7.$ So, the electronic configuration of the element X is 2, 8, 7.

(ii) Since the outermost shell has 7 electrons in its outermost shell means that it requires one more electron to acquire noble gas configuration. So, the valency of X is 1.

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