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2, 8 , 9 , 2
2 , 8 , 18 , 1
2, 8 , 18 , 2
2 , 8 , 8 2
Answer :
3
Solution :
We know that mass of a proton is 1837 times that of an electron.
∴ Atomic number of element =551101837=30
∴ Electronic configuration of the element is 2 , 8 , 18 , 2
OKAY
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