Yes. All matter is composed of atoms.
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Yes, a Basketball is made up of atoms. The atoms are arranged in molecules that form the materials used to make the basketball, such as rubber or leather.
A basketball is made out of atoms.
No, a compound with the formula C6H12O6 is not made up of 3 atoms. It has a total of 24 atoms: 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
Divide that number of atoms by 6.02x10^23 atoms/mole
No. Think of it this way - say you had 20 basketballs and 20 bowling balls. Will the basketballs weigh the same as the bowling balls? No, because an individual basketball weighs less than a bowling ball, so if you have equal numbers of them, they aren't going to weigh the same. Now take 6.02 × 1023 atoms (one mole) of neon and 6.02 × 1023 atoms of aluminum. One atom of neon is going to weigh less than one atom of aluminum, so equal numbers of them aren't going to weigh the same.
Atoms of nonmetals tend to be smaller than atoms of metals in the same period.