Hi
Here are the most appropriate matches:
1) Germanium : Metalloid.
Germanium or Ge is a metalloid that belongs to the group of carbon atom. It is hard, lustrous and greyish white in color.
2) Magnesium : Active metal.
Magnesium or Mg belongs to the group 2 . It has low electronegativity and ionization energy so it can lose two electrons that is why it is considered to be an active metal.
3) Thorium : Actinoid series.
Thorium or Th is considered to be a very radioactive metal with atomic number as 90 belonging to Actinoid series.
4) Iodine: Halogen.
Iodine exists in group 17 of periodic table that is a group of halogens or salt formers (Cl, F, Br, I, At and Ts). Iodine is a member of the group that is why most suited with it.
5) Krypton: Noble gas.
Krypton belongs to the group 18 of periodic table in which all noble gases exist like helium , argon, neon , krypton, radon (Rn) and xenon.
6) Nickel : Transition metal.
Nickel (Ni) is a very important that absorbs visible light when it is present in ionic form. This is because it is more reactive when its electrons are in d orbitals.
Hope it helps!