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22/11/2020 1:17 pm
Topic starter
An element ‘X’ belongs to 3rd period and group 17 of the periodic table. State its
(a) electronic configuration,
(b) valency. Justify your answer with reasoning.
1 Answer
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22/11/2020 1:17 pm
(a) X(17) : 2, 8, 7
(b) Valency : 1
It has atomic number 17 and therefore, electronic configuration will be 2, 8, 7. It can gain one electron to become stable therefore, its valency is equal to 1. It belongs to third period, as it has three shells. It belongs to group 17 because it has 7 valence electrons.