Work the atomic numbers

Exercise and reference answers

Questions

1. Answer

   1807

   Question

   Year Dalton first published his atomic theory

2. Answer

   4

   Question

   Elements in Aristotle's scheme of matter

3. Answer

   12

   Question

   Isotope whose atom defines one twelfth of an amu, by mass number

4. Answer

   2

   Question

   Ratio of chlorine masses in the two copper compounds

Instructions

Work out each value and key the number in.

Explanation