Number of paramagnetic ions among the following d- and f-block metal ions is ____. Mn^2+, Cu^2+, Zn^2+, Yb^2+, Sc^3+, La^3+, Gd^3+, Lu^3+, Ti^4+,…

Number of paramagnetic ions among the following d- and f-block metal ions is $\displaystyle \_\_\_\_$. $\displaystyle \mathrm{Mn}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Yb}^{2+}, \mathrm{Sc}^{3+}, \mathrm{La}^{3+}, \mathrm{Gd}^{3+}, \mathrm{Lu}^{3+}, \mathrm{Ti}^{4+}, \mathrm{Ce}^{4+}$ (Atomic number of $\displaystyle \mathrm{Mn}=25, \mathrm{Cu}=29, \mathrm{Zn}=30, \mathrm{Yb}=70, \mathrm{Sc}=21, \mathrm{La}=57, \mathrm{Gd}=64, \mathrm{Lu}=71, \mathrm{Ti}=22$, $\displaystyle \mathrm{Ce}=58$ )