Parts of Atom

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  • PROTON
  • NEUTRON
  • ELECTRON
  • The proton is found in the NUCLEUS of the atom. It has a relative charge of +1 and a relative mass of 1 amu.
  • ATOMIC NUMBER
  • The atomic number is 3.
  • The neutron is found in the NUCLEUS of the atom. It has a relative charge of 0 and a relative mass of 1 amu.
  • MASS NUMBER
  • The mass number is 7. 3 + 4 = 7
  • The electron is found outside the NUCLEUS of the atom. It has a relative charge of -1 and a relative mass of ~0 amu.
  • TRY IT!
  • The atomic number tells us the number of PROTONS in an atom. Since atoms have no charge, it also tells us the number of ELECTRONS in an atom.
  • The mass number is the sum of PROTONS + NEUTRONS in the atom. Since protons and neutrons each have a mass of 1 amu, their sum is the same as the mass.
  • What are the atomic number and mass number of this atom?
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