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L3-Properties_of_Atoms - milk element box of raisin bran...

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Part I Properties of Atoms 1 milk box of raisin bran element molecule compound substance heterogeneous mixture homogeneous mixture + 2 milk box of raisin bran element X X molecule X X compound X substance X X X heterogeneous mixture X X homogeneous mixture X + 3 Atomic Numbers and Isotopes atomic number: the number of protons in the nucleus of an atom always an integer defines the element atomic mass: the sum of the protons and neutrons in the nucleus of an atom atoms of an element with different numbers of neutrons are isotopes of that element nuclide symbol: a representation of the nuclear makeup of an element 4
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Nuclide Symbols 1. The symbol for the element (E) 2. The atomic number (Z) 3. The mass number (A) E A Z element symbol atomic number mass number Why is the number of neutrons not included in the nuclide symbol? 5 Mass number = number of protons + number of neutrons H 2 1 element: hydrogen number of protons: 1 number of neutrons = mass number - number of protons = 2 - 1 = 1 6 H 2 1 ! Since the number of protons determines the element identity, and the element symbol also gives the identity, having both pieces of information is redundant.
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