Atoms1 (2) - 11+12=23 amu Ø Electrons (e-) are negativel y...

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Atoms Ø Atoms  are the simplest part of an element that keeps all of the element’s properties Ø Atoms are  too small  to be seen so scientists have developed  models  that show their  Ø Atoms consist of 3 kinds of  subatomic particles  –  protons neutron s in the  center or nucleus, and  electrons  spinning in energy levels around the center Ø The  nucleus  is the center of an atom where most of the mass is concentrated Ø Protons  are  positively  charged (  p +  ),  have a mass of  1 amu  (atomic mass unit) , are  found in the  nucleus , and  determine the atomic n umber of the element Example: Carbon has 6 protons so its atomic number is 6 Ø Neutrons  are  neutral  or have no electrical charge  (n) , have a mass of  1 a mu, are  found in the  nucleus , and  when added to the number of protons, determine the atomic mass of the element Example: Sodium has 11 protons and 12 neutrons so its atomic mass is
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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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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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Atoms1 (2) - 11+12=23 amu Ø Electrons (e-) are negativel y...

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