3.5x10^5 x 4.81x10^-3

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth

How many atoms or molecules are there in a mole of a substance?

Write balanced nuclear equations for the formation of five elements whose atomic number is between helium (2) and iron (26):