Textbook Question
Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.
c. How are they different?
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Ch.4 Atoms and Elements
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353
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Table of contents
- Ch.1 Chemistry in Our Lives11
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy54
- Ch.4 Atoms and Elements51
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions41
- Ch.8 Gases29
- Ch.9 Solutions51
- Ch.10 Acids and Bases and Equilibrium65
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons78
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones83
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides90
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis83
- Ch.18 Metabolic Pathways and ATP Production67
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Not the one you use?Change textbook
Chapter 4, Problem 54e
What is the group number and number of valence electrons for each of the following elements?
e. barium
Verified step by step guidance1
Identify the position of barium on the periodic table. Barium (Ba) is located in Group 2, also known as the alkaline earth metals.
Understand that the group number corresponds to the number of valence electrons for elements in Groups 1 and 2. Since barium is in Group 2, it has 2 valence electrons.
Recall that valence electrons are the electrons in the outermost energy level of an atom. For barium, these electrons are in the 6s orbital.
Note that the number of valence electrons determines the chemical reactivity and bonding behavior of the element. Barium, with 2 valence electrons, tends to lose these electrons to form a +2 ion in chemical reactions.
Summarize: Barium is in Group 2 of the periodic table and has 2 valence electrons.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Group Number
The group number in the periodic table indicates the column in which an element is located. Elements in the same group share similar chemical properties and have the same number of valence electrons. For example, barium is located in Group 2, which means it is an alkaline earth metal.
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Valence Electrons
Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding. The number of valence electrons determines how an element interacts with others. Barium, being in Group 2, has two valence electrons, which influences its reactivity and bonding behavior.
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Periodic Table
The periodic table is a systematic arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties. It provides essential information about the elements, including their group numbers and valence electrons. Understanding the layout of the periodic table is crucial for predicting the behavior of elements like barium.
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Related Practice
Textbook Question
Argon has three naturally occurring isotopes, with mass numbers 36, 38, and 40.
d. Why is the atomic mass of argon listed on the periodic table not a whole number?
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Textbook Question
Indium consists of two isotopes, 11349In and 11549In. If the atomic mass for indium on the periodic table is 114.8, are there more atoms of 11349In or 11549In in a sample of indium?
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Textbook Question
Write the group number and draw the Lewis symbol for each of the following elements:
c. calcium
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Textbook Question
Write the group number and draw the Lewis symbol for each of the following elements:
e. gallium
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Textbook Question
Fill in the following blanks using larger or smaller, higher or lower. Mg has a _______ atomic size and a _______ ionization energy than Cs.
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