In the periodic table,with an increase in atomic number,how does the metallic character of an element change?

Which of the following oxides is most basic?

Which one is the strongest acid?

Among $Al_2O_3$,$SiO_2$,$P_2O_3$ and $SO_2$,the correct order of acid strength is

The periodic table consists of $18$ groups. An isotope of copper,on bombardment with protons,undergoes a nuclear reaction yielding element $X$ as shown below. To which group,element $X$ belongs in the periodic table?
${}_{29}^{83}Cu + {}_{1}^{1}H \rightarrow 6{}_{0}^{1}n + {}_{2}^{4}\alpha + 2{}_{1}^{1}H + X$

Which of the following orders of acidic strength is correct?