atom - uncharged particles made up of smaller, charged particles, subatomic - smaller than an atom, nucleus - the positively charged centre of an atom, proton - a positively charged subatomic particle, neutron - an uncharged subatomic particle, electron - a negatively charged subatomic particle with almost no mass, orbit - the movement an electron takes around a nucleus, shell - a group of similar electron orbits, element - a type of atom with a certain number of protons,

Material world - atomic structure

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