The number of elements in the 5^{th} period o | vedclass

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(C) The $5^{th}$ period starts with atomic number $37$ $(Rb)$ and ends with atomic number $54$ $(Xe)$.These elements involve the filling of $5s$,$4d$,

Vedclass · Accepted Answer

$18$

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(C) The $5^{th}$ period starts with atomic number $37$ $(Rb)$ and ends with atomic number $54$ $(Xe)$.These elements involve the filling of $5s$,$4d$,and $5p$ orbitals.The number of elements in a period is determined by the number of electrons that can be accommodated in these orbitals.Total number of elements = (number of electrons in $5s$) + (number of electrons in $4d$) + (number of electrons in $5p$) = $2 + 10 + 6 = 18$ elements.

The number of elements in the $5^{th}$ period of the periodic table are

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