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- An element with atomic number 23 belongs to which period?Option: 1 3rd periodOption
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An element with atomic number 23 belongs to which period?
3rd period
2nd period
5th period
4th period
Answers (1)
How to find Group, Periods and Blocks of any element -
Period
The period of any element is determined by the last shell in which the last electrons enters. For example, Fe atomic number is 26. The electronic configuration can be written as:
1s22s22p63s23p64s23d6
Now, the last electron enters into the d-subshell and shell is 3. Therefore, Fe belongs to third period.
-
we have to check the last shell. The shell with a higher value of the principal quantum number(n) is the period for that element.
Electronic configuration of element having atomic number 23, is = [Ar] 3d3 4s2
The shell having a higher value of n is 4s. Therefore the period is = 4.
Therefore, Option(4) is correct.
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