atom - the smallest piece of an element that retains all the properties of that element, element - Composed of only one kind of atom, proton - positively charged, found in the nucleus, neutron - no charge, found in the nucleus, electron - negatively charged, found in the energy levels, nucleus - composed of protons and neutrons, atomic number - the number of protons in the nucleus, mass number - SUM of protons and neutrons, Which three values are the same in a neutral atom? - protons, electrons, atomic number, How to find the number of neutrons - mass number - atomic number, Number of electrons in the first energy level - 2, Number of electrons in the second energy level - 8, Number of electrons in the third energy level for 8th grade - 8*, atomic mass - the average mass of an atom, The charge of the nucleus - is always positive, The charge of the electron cloud - is always negative, subatomic particles that are equal in mass - protons and neutrons, subatomic particle that the mass is so small it does not count - electrons,

Atomic Structure

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