Ch 4 ppt0 - Introductory Chemistry, 3rd Edition Nivaldo Tro...

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Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA Introductory Chemistry , 3 rd Edition Nivaldo Tro Chapter 4 Atoms and Elements 2009, Prentice Hall
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2 General Features of the Atom
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3 Properties of the Three Key Subatomic Particles Charge Mass Relative 1+ 0 1- 1.00727 1.00866 0.00054858 = 1/1836 Absolute(g) -24 -24 -28 Location in the Atom Nucleus Outside Nucleus Nucleus Name(Symbol) Electron (e - ) Neutron (n 0 ) Proton (p + )
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4 Practice—An Atom Has 20 Protons. Determine if Each of the Following Statements Is True or False? If it is a neutral atom, it will have 20 electrons. If it also has 20 neutrons, its mass will be approximately 40 amu. If it has 18 electrons, it will have a net 2 - charge. True True False
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5 Elements Each element has a unique number of protons in its nucleus. All carbon atoms have 6 protons in their nuclei. The number of protons in the nucleus of an atom is called the atomic number . Z is the short-hand designation for the atomic number. Because each element’s atoms have a unique number of protons, each element can be identified by its atomic number . The elements are arranged on the Periodic Table in order of their atomic numbers. Each element has a unique name and symbol. The symbol is either one or two letters One capital letter or one capital letter + one lower case letter.
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6 The Periodic Table of Elements Atomic number Atomic mass Element symbol
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7 Atomic Symbols, Numbers, Isotopes J = Atomic symbol of the element A = mass number; A = Z + N A Z Z = atomic number = # of protons N = number of neutrons in the nucleus J The Symbol of the Atom or Isotope Isotope = atoms of an element with the same number of protons, but a different number of neutrons
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8 Figure 3.98a
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9 Metals and Nonmetals Metals tend to lose electrons and form positively charged ions – Cations Nonmetals tend to gain electrons and form negatively charged ions - Anions
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10 Metal and Nonmetals = Metal = Metalloid = Nonmetal
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Review What is the atomic number of boron, B? What is the atomic mass of silicon, Si? How many protons does a chlorine atom have? How many electrons does a neutral neon atom have? Will an atom with 6 protons, 6 neutrons, and 6 electrons be electrically neutral? Will an atom with 27 protons, 32 neutrons, and 27
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Ch 4 ppt0 - Introductory Chemistry, 3rd Edition Nivaldo Tro...

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