Which of the following statements is not true of Dalton's theory?

Dalton's atomic theory was given by John Dalton. 
According to his theory:
(a) Matter is made up of invisible particles known as atoms.
(b) The properties of all the atoms of a given element are the same including mass.
(c) Atoms of different elements combine in fixed ratios to form compounds.
(d) Atoms are neither created nor destroyed.
(e) The formation of new products results from the rearrangement of existing atoms.
(f) Atoms of an element are identical in mass, size and properties.