1) Germanium is metalloid.
Germanium (symbol: Ge) is a lustrous, hard, grayish-white metalloid in the carbon group.
2) Magnesium is active metal.
Magnesium (Mg) is metal from 2. group of Periodic table of elements and has low ionisation energy and electronegativity, which means it easily lose valence electons (two valence electrons).
3) Thorium is actinoid series.
Thorium (Th) is radioactive metallic chemical element with atomic number 90.
4) Iodine is halogen.
In VIIA or group 17 (hologen elements) there are six elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At).and tennessin(Ts).
They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the octet rule.
5) Krypton is noble gas.
Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
6) Nickel is transition metal.
Nickel (Ni) is transition metal and the metal ion absorbs visible light, because of the valence electrons in the metal ion’s d-orbitals.
