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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 21E
Textbook Problem
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The following isotopes have applications in medicine. Write their symbols in the form X Z A .

a. cobalt-60

b. phosphorus-32

c. iodine-131

d. sulfur-35

Interpretation Introduction

Interpretation:

The symbol for each of the given isotopes along with atomic number and mass number is to be represented.

Concept Introduction:

 An atom consists of the nucleus and extra nuclear space.

 Atoms of an element can exist in more than one forms. Each form is termed as an isotope and differs from other forms by the number of neutrons, while the number of protons and electrons are equal and same in all the forms.

 The number of electrons of an ion is given by subtracting the charge from the atomic number.

 The atomic number (Z) of an atom or an ion is given by the number of protons while mass number (A) is the sum of the number of protons and neutrons. Atomic number is written as the subscript and mass number is written as the superscript along the symbol for the element.

Explanation of Solution

a)Cobalt60

The atomic number and mass number are calculated as follows:

Number of protons in cobalt = 27Atomic number = 27Mass number = 60

Therefore, the symbol is 2760Co

b)Phosphorus32

The atomic number and mass number are calculated as follows:

Number of protons in phosphorus = 15Atomic number = 15Mass number = 32

Therefore, the symbol is 1532P

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Chapter 3 Solutions

Chemistry In Focus
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