How to find the number of atoms in an element?

To calculate the number of atoms in a sample, you need to find how many moles of the element the sample contains. A mole is a unit chemists use. It's equal to Avogadro's number (6.02 X 10 23) of atoms. By definition, the weight of one mole of an element (its molar mass) is equal to its atomic weight in grams. read more

The number of electrons will equal the number of protons in a neutral atom. The atomic mass is the number of protons plus neutons, so to find the number of neutrons, you can subtract the atomic number from the atomic mass. read more

Avogadro's constant -- 6.02 x 10^23 -- describes the number of atoms in a mole of an element. Weighing a sample of an element gives you its mass in grams. If you have all three pieces of information -- atomic weight, grams and Avogadro's number -- you can calculate the number of atoms in the sample. read more

To calculate the number of atoms in a sample, you need to find how many moles of the element the sample contains. A mole is a unit chemists use. It's equal to Avogadro's number (6.02 X 10 23) of atoms. read more