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, This names the element, protons, 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, An ion has more ________ than protons, electrons, An isotope has more _______ than protons, neutrons, A valence electron tells you ...., the amount of outermost electrons

Atomic Structure

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