# Give the atomic number ( Z ) and mass number ( A ) for each of the following: a. an oxygen atom with 8 neutrons b. a chlorine atom with 18 neutrons c. a sodium atom with 12 neutrons d. a uranium atom with 143 neutrons

### Chemistry In Focus

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

Chapter
Section

### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 3, Problem 20E
Textbook Problem
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## Give the atomic number (Z) and mass number (A) for each of the following:a. an oxygen atom with 8 neutronsb. a chlorine atom with 18 neutronsc. a sodium atom with 12 neutronsd. a uranium atom with 143 neutrons

Interpretation Introduction

Interpretation:

The atomic number and the mass number for each of the given elements are to be determined.

Concept Introduction:

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

 Atoms of an element can exist in more than one form. 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 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.

### Explanation of Solution

a) An oxygen atom with 8 neutrons

The atomic number and mass number are represented as follows:

Number of protons in oxygen = 8Atomic number = 8Number of neutrons = 8Mass number = Atomic number + number of neutrons                      = 8 + 8 = 16

Thus, the mass number is 16 and the atomic number is 8.

b) A chlorine atom with 18 neutrons.

The atomic number and mass number are calculated as follows:

Number of protons in chlorine = 17Atomic number = 17Number of neutrons = 18Mass number = Atomic number + number of neutrons                      = 17 + 18 = 35

Therefore, the mass number is 35 and the atomic number is 17.

c) A sodium atom with 12 neutrons

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