29. If there can be 3 values of spin quantum number then how many elements will be present in third period?

Q. How many $d$-electrons in $C{u}^{+}$ (Atomic number $29$) can have the spin quantum $(-\frac{1}{2})$?

Q. How many elements would be in the third period of the periodic table if the spin quantum number $m_s$ could have the value $-\frac{1}{2}$, $0$ and $+\frac{1}{2}$?

Q. An electron having spin quantum number of $s=\frac{-1}{2}$ and magnetic quantum number $m=+3$ can be present in :

Q. How many elements will be present in $5^{th}$ period of the periodic table? Justify using quantum numbers.

Q. How many $d$-electrons in ${Cu}^{+}$ (Atomic number $=29$) can have the spin quantum number $(-\frac{1}{2})$?