Which pairs of reactants will result in a chemical reaction? Refer to the activity series as needed. Pb ( s ) + MgCl 2 ( aq ) Pb(s)+MgCl2(aq) Al ( s ) + AgClO 3 ( aq ) Al(s)+AgClO3(aq) Cd ( s ) + CuNO 3 ( aq ) Cd(s)+CuNO3(aq) Pt ( s ) + CoBr 2 ( aq )

Al (s) + AgClO3 (aq) will result in a chemical reaction.

Al(s) + 3AgClO₃(aq) > Al(ClO₃)₃(aq) + 3Ag(s)

Cd(s) + CuNO3(aq) will also result in a chemical reaction.

Cd(s) + 2CuNO₃ > Cd(NO₃)₂ + 2Cu

Explanation:

For chemical reactions, metals lower on the activity series cannot normally displace ions of metals higher than them in the activity series.

Metals at the lower end of the activity series are not easily oxidized.

The activity series is attached to this solution. (Note: Cadmium is not on the attached chart, but Cadmium is between Iron (Fe) & Cobalt (Co) on the activity series)

- Pb is way lower Mg in the activity series, hence, it cannot become oxidized by displacing Mg2+ ion in solution.

- Al is way higher than Ag in the activity series. Hence it will easily be oxidized and displace displace Ag from it's solution easily.

- Cadmium will displace Copper in solution too because Cd is higher than Cu on the activity series.

- Platinum cannot displace Cobalt from solution as Pt is lower than Co on the activity series.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.