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