Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 2: Problem 61

How many protons and neutrons are in the nucleus of each of the following atoms? In a neutral atom of each element, how many electrons are present? a. \({ }^{79} \mathrm{Br}\) b. \(^{81} \mathrm{Br}\) c. \({ }^{239} \mathrm{Pu}\) d. \({ }^{133} \mathrm{Cs}\) e. \({ }^{3} \mathrm{H}\) f. \({ }^{56} \mathrm{Fe}\)

Short Answer

Expert verified
a. \(^{79} \mathrm{Br}\): 35 protons, 44 neutrons, and 35 electrons b. \(^{81} \mathrm{Br}\): 35 protons, 46 neutrons, and 35 electrons c. \(^{239} \mathrm{Pu}\): 94 protons, 145 neutrons, and 94 electrons d. \(^{133} \mathrm{Cs}\): 55 protons, 78 neutrons, and 55 electrons e. \(^{3} \mathrm{H}\): 1 proton, 2 neutrons, and 1 electron f. \(^{56} \mathrm{Fe}\): 26 protons, 30 neutrons, and 26 electrons

Step by step solution

01

Finding the Atomic Number and Symbol

First, we need to find the atomic number for each element, which also tells us the number of protons. We can look up the atomic number using a periodic table or by knowing their symbols. Here are the atomic numbers for each element: - Br (Bromine) - atomic number 35 - Pu (Plutonium) - atomic number 94 - Cs (Cesium) - atomic number 55 - H (Hydrogen) - atomic number 1 - Fe (Iron) - atomic number 26 Now we can find the number of protons, neutrons, and electrons for each atom.
02

a. \({ }^{79} \mathrm{Br}\)

Using the atomic number (35) and mass number (79), we can find the number of neutrons by subtracting the number of protons from the mass number. Number of Protons: 35 Number of Neutrons: 79 - 35 = 44 Number of Electrons: 35 (since the atom is neutral)
03

b. \(^{81} \mathrm{Br}\)

Using the atomic number (35) and mass number (81), we can find the number of neutrons. Number of Protons: 35 Number of Neutrons: 81 - 35 = 46 Number of Electrons: 35 (since the atom is neutral)
04

c. \({ }^{239} \mathrm{Pu}\)

Using the atomic number (94) and mass number (239), we can find the number of neutrons. Number of Protons: 94 Number of Neutrons: 239 - 94 = 145 Number of Electrons: 94 (since the atom is neutral)
05

d. \({ }^{133} \mathrm{Cs}\)

Using the atomic number (55) and mass number (133), we can find the number of neutrons. Number of Protons: 55 Number of Neutrons: 133 - 55 = 78 Number of Electrons: 55 (since the atom is neutral)
06

e. \({ }^{3} \mathrm{H}\)

Using the atomic number (1) and mass number (3), we can find the number of neutrons. Number of Protons: 1 Number of Neutrons: 3 - 1 = 2 Number of Electrons: 1 (since the atom is neutral)
07

f. \({ }^{56} \mathrm{Fe}\)

Using the atomic number (26) and mass number (56), we can find the number of neutrons. Number of Protons: 26 Number of Neutrons: 56 - 26 = 30 Number of Electrons: 26 (since the atom is neutral)

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Identify each of the following elements. Give the number of protons and neutrons in each nucleus. a. \({ }_{15}^{31} X\) b. \({ }_{53}^{127} \mathrm{X}\) c. \({ }_{19}^{39} \mathrm{X}\) d. \({ }_{70}^{173} \mathrm{X}\)

Write the formula for each of the following compounds: a. sulfur difluoride b. sulfur hexafluoride c. sodium dihydrogen phosphate d. lithium nitride e. chromium(III) carbonate f. tin(II) fluoride g. ammonium acetate h. ammonium hydrogen sulfate i. cobalt(III) nitrate j. mercury(1) chloride k. potassium chlorate l. sodium hydride

Which of the following statements is(are) true? For the false statements, correct them. a. Most of the known elements are metals. b. Element 118 should be a nonmetal. c. Hydrogen has mostly metallic properties. d. A family of elements is also known as a period of elements. e. When an alkaline earth metal, A, reacts with a halogen, \(\mathrm{X}\), the formula of the covalent compound formed should be \(\mathrm{A}_{2} \mathrm{X}\)

Each of the following compounds has three possible names listed for it. For each compound, what is the correct name and why aren't the other names used? a. \(\mathrm{N}_{2} \mathrm{O}\) : nitrogen oxide, nitrogen(I) oxide, dinitrogen monoxide b. \(\mathrm{Cu}_{2} \mathrm{O}\) : copper oxide, copper(I) oxide, dicopper monoxide c. \(\mathrm{Li}_{2} \mathrm{O}\) : lithium oxide, lithium(I) oxide, dilithium monoxide

What number of protons and neutrons are contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons are present? a. \(\frac{235}{92} \mathrm{U}\) b. \(^{27} \mathrm{Al}\) c. \(\frac{57}{26} \mathrm{Fe}\) d. \(\frac{208}{81} \mathrm{~Pb}\) e. \(\frac{\mathrm{x}}{37} \mathrm{Rb}\) f. \({ }_{21}^{4} \mathrm{Ca}\)
See all solutions

Recommended explanations on Chemistry Textbooks

Physical Chemistry

Read Explanation

Chemistry Branches

Read Explanation

The Earths Atmosphere

Read Explanation

Organic Chemistry

Read Explanation

Chemical Reactions

Read Explanation

Kinetics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free