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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Cobalt has three radioactive isotopes used in medical studies. Atoms of these isotopes have 30, 31, and 33 neutrons, respectively. Give the complete symbol for each of these isotopes.

Interpretation Introduction

Interpretation:

The complete symbols of cobalt’s three isotopes has to be determined, if the isotopes have 30, 31 and 33 neutrons.

Concept Introduction:

  • The atomic number of cobalt is 27.
  • Equation for mass number is,

    massnumber=numberofprotons+numberofneutrons

  • The complete symbol for an atom include mass number and atomic number in such a way that,

    XatomicnumberZmassnumberAElementsymbol 

Explanation

The atomic number of cobalt is  27

The numbers of neutrons for isotopes are given as 30, 31 and 33

Equation for finding mass number is,

    massnumber=numberofprotons+numberofneutrons

Therefore,

The mass numbers of three isotopes of cobalt are,

    (27+30

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