how can find the weigh of one atom.?

Question

one of my friends asked me about finding the weigh of one atom.i don't know the answer.so i need to your help.and i will be thankfull.

Answer 1

Look up the atomic weight on the periodic table - for instance, for oxygen it is 16.00 - and then divide by Avogadro's number (6.02×10^23) to get the mass in grams. For the oxygen atom, you'd get a mass of 2.66×10^-23 grams.