Is there a lot of atoms in 1g of
powder ?
Ex. with Hydrogen: one hydrogen atom is about 1 amu ; One gram is about
600,000,000,000,000,000,000,000 amu (that's 600 sextillion, or a 6 followed by 23
zeros).
Ex. with Gold: one gold atom is about 197 amu ; one gram is about
3,000,000,000,000,000,000,000 atoms of gold ; 3 Billion of Trillion atoms of Gold
per gram of Gold.
Electrons are so light that you can usually ignore their mass relative to the atom
as a whole. A proton has about 2000 times the mass of an electron. from
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