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

3. Ionic Compounds

Ionic Bonding

GOB Chemistry

3. Ionic Compounds

Ionic Bonding

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1:57 minutes

Problem 150b

Textbook Question

Identify the group number in the periodic table of X, a representative element, in each of the following ionic compounds:
b. X₂SO₃

Verified step by step guidance

Step 1: Analyze the chemical formula X₂SO₃. The subscript '2' indicates that there are two atoms of element X in the compound. SO₃ is the sulfite ion, which has a charge of -2.

Step 2: Determine the total positive charge contributed by the two X atoms. Since the compound is neutral overall, the total positive charge must balance the -2 charge of the sulfite ion. Therefore, the two X atoms together must contribute a +2 charge.

Step 3: Calculate the charge of a single X atom. Since there are two X atoms contributing a total charge of +2, each X atom must have a charge of +1.

Step 4: Identify the group number of an element with a +1 charge. Elements that form +1 ions are typically found in Group 1 (alkali metals) of the periodic table.

Step 5: Conclude that element X is a representative element from Group 1 of the periodic table, as it forms a +1 ion in this compound.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Representative Elements

Representative elements are found in groups 1, 2, and 13-18 of the periodic table. They are characterized by their ability to form a wide variety of compounds and exhibit predictable properties based on their group. Understanding the group number of these elements is essential for predicting their behavior in chemical reactions, including their oxidation states in ionic compounds.

Ionic Compounds

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of positively charged cations and negatively charged anions. The overall charge of the compound is neutral, and the arrangement of these ions in a lattice structure contributes to the compound's stability and properties. Identifying the ions in a compound like X₂SO₃ is crucial for determining the group number of the representative element X.

Group Number and Valence Electrons

The group number in the periodic table indicates the number of valence electrons in the outer shell of an element. This is significant because the valence electrons determine how an element interacts with others, including its ability to form ionic bonds. For representative elements, knowing the group number helps in predicting the charge of the ions they form in compounds, such as in X₂SO₃.

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