Lec-04-Chap-02-2P - 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 Example: Neon Mass number Relative abundance Isotopes and Atomic Mass Isotopes Isotopes Atoms of the same element same element with different atomic mass, A equal numbers of p + different numbers of n 0 H 1 p + , 0 n 0 1 1 2 1 H 1 p + , 1 n 0 3 1 H 1 p + , 2 n 0 protium deuterium (D) tritium (T) Hydrogen isotopes: Natural abundance 99.985% 0.0148% Very low, radioactive Isotopes and Atomic Mass Question: Why are the atomic masses of individual isotopes not exactly the sum of the masses of the individual protons and neutrons (+ electrons)?
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