Lithium
Sodium
Potassium
Cesium
an inert gas
an artificial fibre
an explosive
a metal
Li
Na
K
Rb
zinc and hydrochloric acid
magnesium carbonate and hydrochloric acid
magnesium nitrate and hydrochloric acid
magnesium sulphate and hydrochloric acid
Oxygen
Sulphur
Nitrogen
Carbon
Aluminium (AI)
Manganese (Mn)
Magnesium (Mg)
Calcium (Ca)
Mercury
Lead
Sodium
Calcium
Hydrogen
Oxygen
Hydrogen peroxide
Ozone
Carbon
Oxygen
Nitrogen
Argon
`F < O < N < C`
`O < N < C < F`
`C < N < F < O`
`C < N < O < F`
`Hg, Fe, Zn`
`Hg, Sn, Pb`
`Zn, Pb, Sn`
`Hg, Ga, Cs`
Argon
Krypton
Radon
Xenon