Select the compounds below that are covalent: aubr3 b2h6 hcl ca3(po4)2 mno2 sn(so4) nh3 al(oh)3 no2 s2f4

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