MASC 110 Solution HW1

MASC 110 Solution - University of Southern California MASC 110L Solution Set#1 E Goo 1 What are the atomic number and approximate atomic weight

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University of Southern California MASC 110L Solution Set #1 E. Goo 1. What are the atomic number and approximate atomic weight element each of whose nuclei contains 81 protons and 122 neutrons? Give the complete symbol for this nuclide, including chemical symbol, atomic number, mass number, and neutron number. There are 81 protons so the atomic number is 81. The approximate atomic weight is 81+122=203(note this is roughly 2.5 times the atomic number which is the rough guideline for heavy elements mentioned in lecture) Thallium is atomic number 81 and the chemical symbol is Tl the atomic number is 81, the mass number is 203 and the neutron number is 122. The complete symbol for the nuclide(nucleus) is 122 203 81 Tl 2. How many protons and how many neutrons are there in the nucleus of the isotope of cobalt with mass number 60? Of the isotope of nickel with mass number 60? Of the isotope of plutonium with and mass number of 238? Cobalt is atomic number 27 and therefore has 27 protons. Since the mass number is 60 there are 60-27=33 neutrons. Nickel is atomic number 28 and therefore has 28 protons. Since the mass number is 60 there are 60-28=32 neutrons. Plutonium is atomic number 94 and therefore has 94 protons. Since the mass number is 238 there are 238-94=144 neutrons. 3.

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This note was uploaded on 02/13/2009 for the course MASC 110L taught by Professor Goo during the Spring '07 term at USC.

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MASC 110 Solution - University of Southern California MASC 110L Solution Set#1 E Goo 1 What are the atomic number and approximate atomic weight

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