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 electron cloud, nucleus - composed of protons and neutrons, atomic number - the number of protons in the nucleus, atomic mass - sum of protons and neutrons, Which three values are the same? - protons, electrons, atomic number, How to find the number of neutrons - atomic mass - 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 - 18,

Atomic Structure

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