Understanding Atomic Structure
A piece of aluminum foil has a mass of 27 grams. About how many atoms does this contain? (Aluminum has a molecular mass of 27 g/mol.)
6.02 x 10^23 atoms
A computer chip contains 1.20 x 10^23 atoms of silicon. What is its mass? (The molecular mass of silicon is 28 g/mol.)
5.6 grams
Which of the following was the instrument used for the discovery of the electron?
Cathode ray tube