How Big is an Atom?

  • A tower of 10 million atoms would only be as tall as a grain of sand.
  • Picture a walnut sitting in the palm of your hand – if the walnut was an atom then your hand would have to be the size of the Earth.
  • Seven octillion atoms [7,000,000,000,000,000,000,000,000,000] make up your body.

Atoms are held together by electromagnetic forces and they are mostly empty inside. You are made of atoms, so you’re mostly empty space too. Atoms have smaller particles inside them. There’s a nucleus in the centre with a cloud of electrons around it.  Deeper inside are even smaller particles named gluons, muons, strange quarks, and charm quarks. We live inside a vast universe, but there’s also universe inside us


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