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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