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Q: Before 19th century who discovered that each chemical element is made from a unique type of atoms and those atom become different according their atomic mass.
  • A. John Dalton
  • B. Robert Boyle
  • C. Amedeo Avogatro
  • D. Antonie Lnvoisier
Correct Answer: Option A - According Dalton's atomic theory each elements is made from a unique type of atoms and atoms may be different according their atomic mass.
A. According Dalton's atomic theory each elements is made from a unique type of atoms and atoms may be different according their atomic mass.

Explanations:

According Dalton's atomic theory each elements is made from a unique type of atoms and atoms may be different according their atomic mass.