Modern atomic symbols are based on the method proposed by

1. Bohr
2. Dalton
3. Berzelius
4. Alchemist

The number of carbon atoms in a hydrogen carbonate radical is

1. one
2. two
3. three
4. four

In water, the hydrogen-to-oxygen mass ratio is

1. 1 : 8
2. 1 : 16
3. 1 : 32
4. 1 : 64

The formula of sodium carbonate is Na₂CO₃ and that of calcium hydrogen carbonate is

1. CaHCO₃
2. Ca(HCO₃)₂
3. Ca₂HCO₃
4. Ca(HCO₃)₃