Textbook Question
Determine the number of protons and the number of neutrons in each isotope. a. 4019K b. 22688Ra c. 9943Tc d. 3315P
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Ch.2 - Atoms & Elements
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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Table of contents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
Chapter 2, Problem 57d
Determine the number of protons and the number of neutrons in each isotope. d. 20882Pb
Verified step by step guidance1
Identify the atomic number (Z) and the mass number (A) from the isotope notation. For the isotope \(^{208}_{82}\text{Pb}\), the atomic number Z is 82, and the mass number A is 208.
Recall that the atomic number (Z) represents the number of protons in the nucleus of an atom. Therefore, the number of protons in \(^{208}_{82}\text{Pb}\) is 82.
Understand that the mass number (A) is the sum of protons and neutrons in the nucleus. The formula to find the number of neutrons (N) is given by N = A - Z.
Substitute the values of A and Z into the formula to find the number of neutrons: N = 208 - 82.
Calculate the result from the previous step to find the number of neutrons in the isotope \(^{208}_{82}\text{Pb}\). This will give you the total number of neutrons.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Isotopes
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This means they share the same atomic number but have different mass numbers. For example, lead (Pb) has several isotopes, including 208Pb, which has 82 protons and a varying number of neutrons.
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04:36
Isotopes
Atomic Number and Mass Number
The atomic number of an element is the number of protons in its nucleus, which defines the element. The mass number is the total number of protons and neutrons in the nucleus. For the isotope 208Pb, the atomic number is 82, indicating it has 82 protons, while the mass number of 208 indicates the total number of protons and neutrons combined.
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02:19Atomic Mass
Calculating Neutrons
To find the number of neutrons in an isotope, subtract the atomic number from the mass number. In the case of 208Pb, the number of neutrons can be calculated as 208 (mass number) - 82 (atomic number) = 126 neutrons. This calculation is essential for understanding the composition of isotopes.
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01:38Neutron-to-Proton Plot
Related Practice
Textbook Question
Write isotopic symbols in the form AZX for each isotope. b. the iron isotope with 30 neutrons
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Write isotopic symbols in the form AZX for each isotope. c. the rubidium isotope with 45 neutrons
Textbook Question
Determine the number of protons and the number of neutrons in each isotope. a. 147N
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Textbook Question
Determine the number of protons and the number of electrons in each ion. a. Ni2+ b. S2– c. Br– d. Cr3+