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Lec-04-Chap-02-2 - Lecture 04 Atoms and Elements Isotopes...

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1 Lecture 04 Atoms and Elements Isotopes and Atomic Mass 2.6 Amounts of Substances: The Mole 2.7 Molar Mass and Problem Solving 2.8 The Periodic Table 2.9 Lecture 04, Knowledge and Skills • Know how atomic and molecular masses can be determined • Know what isotopes are • Know the notation for isotopes • Work with natural abundances of isotopes • Know all things about and work with the mole Atomic Mass: How Is it Measured? Mass Spectrometer Mass Spectrum Mass number Relative abundance Isotopes and Atomic Mass Isotopes Atoms of the same element same element with different A equal numbers of p + different numbers of n 0 deuterium (D) tritium (T) Hydrogen isotopes: H 1 p + , 0 n 0 1 1 2 1 H 1 p + , 1 n 0 3 1 H 1 p + , 2 n 0 Isotopes and Atomic Mass Most elements occur as a mixture of isotopes Magnesium 24 Mg 25 Mg 26 Mg number of p + 12 12 12 number of n 0 12 13 14 mass / amu 23.985 24.986 25.982 natural abundance (%) 78.70 10.13 11.17 Boron 10 B 11 B number of p + 5 5 number of n 0 5 6 mass / amu 10.0129 11.0093 natural abundance (%) 19.91 80.09 Isotopes and Atomic Mass
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