[CoCl₄]^2-

[FeCl₄]^2-

[NiCl₄]^2-

[PtCl₄]^2-

d-Block elements show irregular and erratic chemical properties among themselves

La and Lu have partially filled d orbitals and no other partially filled orbitals

The chemistry of various lanthanoids is very similar

4f and 5f orbitals are equally shielded

Potassium nitrate

Urea

Superphosphate of lime

Ammonium sulphate

neutron particle emission

positron emission

$$\alpha$$-particle emission

$$\beta$$-particle emission