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Question

The electronic configuration of an element is 2, 7. To which group does this element belong :
Easy

Solution

(d) 17

Since the element has 7 electrons in its valence shell, its valency is 1. To find the group of an element in Modern Periodic Table 10 is added to its valence electron i.c.7+10=17. Thus, it belongs to group 17.

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