What is the electronic configuration of an element of mass 31 and atomic number 15?
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Answer:
Phosphorous
Mass number = 31
Atomic number = 15
To find:
The electronic configuration and valency.
Solution:
Electronic configuration = ( 2, 8, 18, 32, ... )
Here,
The atomic number = 15
And so,
Electronic configuration = ( 2, 8, 5 )
The third shell can occupy 8 electrons or 18 electrons.
Hence, the element needs 3 more electrons to fill the third shell.
Therefore, valency = 3.
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