neutron particle emission

positron emission

$$\alpha$$-particle emission

$$\beta$$-particle emission

Ozone reacts with SO₂ to give SO₃

Silicon reacts with NaOH_(aq) in the presence of air to give Na₂SiO₃ and H₂O

Cl₂ reacts with excess of NH₃ to give N₂ and HCl

Br₂ reacts with hot and strong NaOH solution to give NaBr, NaBrO₄ and H₂O

Potassium nitrate

Urea

Superphosphate of lime

Ammonium sulphate

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