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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 22E
Textbook Problem
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The following isotopes are important in nuclear power. Write their symbols in the form X Z A .

a. U-235

b. U-238

c. Pu-239

d. Xe-144

Interpretation Introduction

Interpretation:

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

Concept Introduction:

An atom consists of a nucleus and extranuclear space.

Atoms of an element can exist in more than one form. Each form is termed as an isotope and only the number of neutrons is different in each form while the number of protons and electrons is the same.

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

Atomic number (Z) of an atom as well as of an ion is equal to the number of protons, whereas the mass number (A) is the sum of the number of protons and neutrons. Atomic number is written as subscript and mass number is written as a superscript.

Explanation of Solution

a) Uranium-235

The atomic number and mass number is calculated as follows:

Therefore, the symbol is U92235

b) Uranium238

The calculation of the atomic number and mass number is as follows:

Hence, the symbol is

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Chapter 3 Solutions

Chemistry In Focus
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