The lab technician places 0.97 moles of magnesium into a beaker. How many magnesium atoms are in the beaker?

There are 5.84*10²³ magnesium atoms in the beaker.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number applies to any substance.

So, to calculate the amount of magnesium atoms present in the beaker, the following rule of three is applied: if by definition of Avogadro's Number in 1 mole there are 6.023*10²³ atoms, in 0.97 moles how many atoms are there?

atoms=5.84*10²³

There are 5.84*10²³ magnesium atoms in the beaker.

neutrons are in the middle of the atom and the electrons, which are much smaller.