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Unformatted text preview: 11+12=23 amu Ø Electrons (e-) are negativel y charged, high energy particles with little mass that spin around the nucleus in energy levels Ø Seve n energy levels (K, L, M, N, O, P, & Q) exist around the nucleus and each holds a certain number of electrons Ø The K energy level is closest to the nucleus & only holds 2 electrons, while the L – Q energy levels can hold 8 electrons Ø Electrons in outer energy level are traveling faster & contain more energy than electrons in inner levels Ø The number of protons (positive charges) and electron s (negative charges in an atom are equal so the net electrical charge on a atom is zero making it electrically neutral Ø Stable or non-reactive atoms have an outer energy level that is filled with electrons...
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