I have been studying a grain of sand under my very poweful 10 X magnifying glass.I still can not see the atoms.My daughter (10 years) tells me they are a lot smaller than that...yeah right !!!..LOL..anyway...my best guess is that there could be about what 20-30 atoms in a grain of sand ?My daughter (still 10 ) reckons there's billions !!..LOL...come on...get real !!..Do I really have to move up to my 15 x magnifying glass to to see them or not ?So, how many atoms are there in a grain of sand...she wins £10 if there is more than a hundred !!I win a hug if there is less....I am confident.