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Question
Electronic configuration of element T is 2, 8, 7.
What is the period number of T ?
Electronic configuration of element T is 2, 8, 7.
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Solution
The correct option is A 3
Given 2,8,7 in this first shell can have 2 electrons where as second shell can have 8 electrons 2 in s orbital and 6 in p orbital.
Hence remaining 7 must be only in third shell as third shell has capacity of 18 electrons. Hence as the valence shell is 3 period is also three.
Given 2,8,7 in this first shell can have 2 electrons where as second shell can have 8 electrons 2 in s orbital and 6 in p orbital.
Hence remaining 7 must be only in third shell as third shell has capacity of 18 electrons. Hence as the valence shell is 3 period is also three.
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