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Comprehension # 1 Read the following r...

Comprehension # 1
Read the following rules and answer the questions at the end of it.
Electrons in various suborbits of an filled in increasing order to their energies.
Pairing of electrons in various orbitals of a suborbit takes places only after each orbital is half-filled.
No two electrons in an atom can have the same set of quantum number.
How many elements would be in the second period of the periodic table if the spin quantum number `(m_(s))` could have the value of -(1)/(2),0,+(1)/(2)`?

A

`8`

B

`10`

C

`12`

D

`18`

Text Solution

Verified by Experts

The correct Answer is:
C
Spin quantum number `(m_(s))=-(1)/(2),0,+(1)/(2)` that is one orbital accomodate maximum `3e^(-)`
Number of element in any period `=3r^(2)`
`n=(p+2)/(2)` (for even period no.)
`n = (2+2)/(2)=2`
number of element `implies 3xx4 implies 12`
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Knowledge Check

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