1An element has three subatomic particles, the proton, the neutron and the electron, yet only the protons and the neutrons are added when its atomic weight is found. Why is that so?
2What is the atomic weight of argon?
3Among potassium (19 protons, 20 neutrons), carbon (6 protons, 6 neutrons), oxygen (8 protons, 8 neutrons) and argon (18 protons, 22 neutrons), which has the greatest atomic weight?
4Distinguish between atomic weight and molecular weight.
5What is the atomic weight of potassium? What is the molecular weight of calcium chloride?
6Write the number of atoms of each element present in one molecule of sulphuric acid \( \mathrm{H_2SO_4} \).
7Show step by step how the molecular weight of water comes to 18 amu.
8An atom has 11 protons and 12 neutrons in its nucleus. What is its atomic weight?
9Find the molecular weight of magnesium oxide.
10Can two different elements have the same atomic weight? Answer with an example.