Why does platinum metal make a good catalytic surface for reactant molecules? it causes reactant molecules to be less reactive. it strengthens bonds between reactant molecules. it prevents products from breaking away from the surface. it holds reactant molecules in a good position for them to react.

It holds reactant molecules in a good position for them to react.

Explanation: Catalysts are substances which increases the rate of reaction by taking the reaction through a different route which involves lower activation energy and do not get itself consumed.

Platinum metal has active sites on its surface and thus more reactant molecules can be brought into closer contact with one another. When more molecules can be brought closer together, there are better chance of an effective collision , i.e. more reactants can be converted to products. Thus the rate of reaction increases and thus platinum act as good catalytic surface.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.