Lecture 6 Chapter 2

Lecture 6 Chapter 2 - General Chemistry I Fall 2007 Joann S...

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Unformatted text preview: General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang Chemistry, 8th ed. Chang Atomic Number, Z Atomic Number, Z All atoms of the same element have All atoms of the same element have the same number of protons in the the same number of protons in the nucleus, nucleus, Z Z 13 13 Al Al 26.981 26.981 Atomic number Atomic number Atom symbol Atom symbol Atomic weight Atomic weight Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Mass Number, A Mass Number, A • C atom with 6 protons & 6 neutrons is the C atom with 6 protons & 6 neutrons is the mass standard mass standard • = 12 atomic mass units = 12 atomic mass units • Mass Number (A) Mass Number (A) = # protons + # neutrons = # protons + # neutrons • A boron atom can have A boron atom can have A = 5 p + 5 n = 10 amu A = 5 p + 5 n = 10 amu A Z 10 5 B Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Is o to pe s • Atoms of the same element (same Z) Atoms of the same element (same Z) but but different mass number (A). different mass number (A). • Boron-10 ( Boron-10 ( 10 10 B) has 5 p and 5 n B) has 5 p and 5 n • Boron-11 ( Boron-11 ( 11 11 B) has 5 p and 6 n B) has 5 p and 6 n 10 B 11 B Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Isotopes of Hydrogen Chemistry for Changing Times , 10th ed., Hill & Kolb Isotopes & Atomic Weight Isotopes & Atomic Weight Due of the existence of isotopes, the mass of an Due of the existence of isotopes, the mass of an element on the P.T. has an average value. element on the P.T. has an average value....
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