# Determine the number of protons, neutrons, and electrons in each of the following: a . 52 Cr 3+ b . 16 O 2- c . 40 Ca 2+

### 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 26E
Textbook Problem
79 views

## Determine the number of protons, neutrons, and electrons in each of the following: a . 52 Cr 3+ b . 16 O 2- c . 40 Ca 2+

Interpretation Introduction

Interpretation:

The protons, neutrons, and electrons for each of the given element are to be determined.

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.

When an atom loses or gains an electron, it is termed as cation or anion, respectively. Cation bears a positive charge and contains more protons than electrons in it. Anion bears a negative charge contains fewer protons than electrons in it.

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

Atomic number (Z) of an atom, as well as ion, is equal to the number of protons while 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.

The number of neutrons in an atom can be calculated by subtracting the atomic number from its mass number.

### Explanation of Solution

a) 52Cr3+

The protons, neutrons, and electrons are calculated as follows:

Atomic number of chromium = 24So, number of protons = 24

Therefore, the number of protons is 24.

Charge = +3 (given)Number of electrons = number of protons - charge                                 = 11 - 3 = 21

Therefore, the number of electrons is 21.

Mass number = 52Number of neutrons = Mass number - Atomic number                                = 52 - 24 = 28

Hence, the number of neutrons is 28.

b) 16O2-

The calculation of protons, neutrons, and electrons is as follows:

Atomic number of oxygen = 8So, number of protons = 8

Thus, the number of protons is 8.

Charge = -2 (given)Number of electrons = number of protons - charge                                 = 8 - (- 2) = 10

Therefore, the number of electrons is 10

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