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Learn the toughest concepts covered in Chemistry with step-by-step video tutorials and practice problems by world-class tutors

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Jules Bruno

Ch.1 - Chemical Tools: Experimentation & Measurement

Ch.2 - Atoms, Molecules & Ions

Ch.3 - Mass Relationships in Chemical Reactions

BONUS: Lab Techniques and Procedures

BONUS: Mathematical Operations and Functions

Ch.4 - Reactions in Aqueous Solution

Ch.5 - Periodicity & Electronic Structure of Atoms

Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory

Ch.7 - Covalent Bonding and Electron-Dot Structures

Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure

Ch.9 - Thermochemistry: Chemical Energy

Ch.10 - Gases: Their Properties & Behavior

Ch.11 - Liquids & Phase Changes

Ch.12 - Solids and Solid-State Materials

Ch.13 - Solutions & Their Properties

Ch.14 - Chemical Kinetics

Ch.15 - Chemical Equilibrium

Ch.16 - Aqueous Equilibria: Acids & Bases

Ch.17 - Applications of Aqueous Equilibria

Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium

Ch.19 - Electrochemistry

Ch.20 - Nuclear Chemistry

Ch.21 - Transition Elements and Coordination Chemistry

Ch.22 - The Main Group Elements

Ch.23 - Organic and Biological Chemistry

Isotopes

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Chapter 2, Problem 40

In the following drawings, red spheres represent protons, and blue spheres represent neutrons. Which of the draw-ings represent different isotopes of the same element, and which represents a different element altogether? (a)
(b)
(c)

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Chapter 2, Problem 40

In the following drawings, red spheres represent protons, and blue spheres represent neutrons. Which of the draw-ings represent different isotopes of the same element, and which represents a different element altogether? (a) (b) (c)

In the following drawings, red spheres represent protons, and blue spheres represent neutrons. Which of the draw-ings represent different isotopes of the same element, and which represents a different element altogether? (a)
(b)
(c)