In order to determine the mass of an atom, you would add :
protons and electrons
all protons
protons and neutrons
neutrons and electrons

Calculate the number of molecules present in 0.750 mol of mgo.

Compare and contrast the bohr model and the electron cloud models of the atom.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)