Why did my dad hasn't come back with the milk for 10 years

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

If you are told to get 100 ml of stock solution to use to prepare smaller size sample for an experiment, which piece of glassware would you use?