Labels:cake | chat room | door | earth | hakham | road | sky | tree | tribute album OCR: INSIDE THE ATOM THE HEART ofan atom is its Fiectron nucleus. small compared with the rest the atom, but 1t contains almost all of the atom mass Protons and neutrons are the particles found here, each with an atomic mass unit of one The number of protons inside the nucleus makes up the atomic number ofan element; the number of protons plus neutrons makes up the mass number. Electrons are outside the nucleus and have little mass Atom shells There area maxi mum seven shells around an atom nucleus, which contain the orb itme Atom shell [Nucleus electrons. Each shell contains only limited number 1 electrons. PARTICLE FACTS INSIDF Electron neutron orbiting
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