Atomic Structure

Atomic Structure - CHEM 1201 SI Worksheet Average Atomic...

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CHEM 1201 SI Worksheet Atomic Structure: Discussion of Protons, Neutrons, Electrons, and Isotopes: Examples: 1. How many protons, neutrons, and electrons are in the following types of atoms or isotopes? Atom/Isotope # of Protons # of Neutrons # of Electrons Hydrogen – 1 Hydrogen – 2 Beryllium – 9 52 Cr 16 O 17 O 43 55 7 6 2. All of the following statements are true EXCEPT a) An electron is much lighter than a proton. b) In an atom, the number of protons is always equal to the number of electrons. c) The mass of a proton is approximately equal to that of an electron. d) Protons in an atom occupy the nucleus of an atom. e) The charge of a proton is equal to the charge of an electron. 3. Given the unidentified isotope 64 30 X, which one of the following is true? a) The atom contains 34 protons. b) The atom contains 64 neutrons. c) The element must be selenium, Se. d) The neutral atom contains 30 electrons e) The number of protons plus electrons in the atom equals 64
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Unformatted text preview: CHEM 1201 SI Worksheet Average Atomic Mass: “ f ” stands for fractional abundance “M” stands for isotopic mass Avg. Atomic Mass = f 1 × M 1 + f 2 × M 2 + f 3 × M 3 + … Note: f 1 + f 2 + f 3 + … = 1 Examples: 1. What is the Avg. Atomic Mass of Hydrogen? Hydrogen – 1 weighs 1.012 amu with a 72.450% of abundance. Hydrogen – 2 (deuterium) weighs 2.024 amu with a 27.060% of abundance. Hydrogen – 3 (tritium) weighs 3.048 amu with a 0.490% of abundance. 2. In the Seven Layers of the Candy Cane Forrest and in the Sea of Swirly, Twirly Gumdrops, Buddy the Elf finds that iron has two naturally occurring isotopes with the following isotopic masses and abundances: Iron – 55 54.90509 amu f 1 = 0.5882 Iron – 57 56.90117 amu f 2 = 0.4118 What is the average atomic mass of iron? 3. If f 1 = 0.7578 with 34.969 amu and f 2 = 0.2422 with 36.966 amu, what is most likely this element?...
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This note was uploaded on 03/21/2011 for the course CHEM 1201 taught by Professor Cook during the Fall '08 term at LSU.

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Atomic Structure - CHEM 1201 SI Worksheet Average Atomic...

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