Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

2. Atoms and the Periodic Table

Valence Electrons of Elements (Simplified)

GOB Chemistry

2. Atoms and the Periodic Table

Valence Electrons of Elements (Simplified)

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1:27 minutes

Problem 54e

Textbook Question

What is the group number and number of valence electrons for each of the following elements?
e. barium

Verified step by step guidance

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.

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.

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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