first 20 + 10 elements

The symbol for Hydrogen is H.

The symbol for Helium is He.

The symbol for Lithium is Li.

The symbol for Beryllium is Be.

The symbol for Boron is B.

The symbol for Carbon is C.

The symbol for Nitrogen is N.

The symbol for Oxygen is O.

The symbol for Fluorine is F.

The symbol for Neon is Ne.

The symbol for Sodium is Na.

The symbol for Magnesium is Mg.

The symbol for Aluminum is Al.

The symbol for Silicon is Si.

The symbol for Phosphorus is P.

The symbol for Sulfur is S.

The symbol for Chlorine is Cl.

The symbol for Argon is Ar.

The symbol for Potassium is K.

The symbol for Calcium is Ca.

The symbol for Iron is Fe.

The symbol for Nickel is Ni.

The symbol for Copper is Cu.

The symbol for Zinc is Zn.

The symbol for Bromine is Br.

The symbol for Silver is Ag.

The symbol for Tin is Sn.

The symbol for Iodine is I.

The symbol for Barium is Ba.

The symbol for Lead is Pb.