The law of constant phosphorus, sulphur and krypton, the elements having the lowest and highest atomicities are respectively:

If 1.4 g of calcium oxide is formed by the complete decomposition of calcium carbonate, then the amount of calcium carbonate taken and the amount of carbon dioxide formed will be respectively:

The law of constant proportions was given by:

One nm is equal to:

The scientist who proposed the first letter (or first letter and another letter) of the Latin or English name of an element as its symbol, was: