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

Periodic Table: Classifications

GOB Chemistry

2. Atoms and the Periodic Table

Periodic Table: Classifications

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5:09 minutes

Problem 11e

Textbook Question

Identify each of the following elements as a metal, a nonmetal, or a metalloid:
e. located in Group 8A (18)

Verified step by step guidance

Step 1: Understand the periodic table grouping. Group 8A (or Group 18) is also known as the noble gases. These elements are located in the far-right column of the periodic table.

Step 2: Recall the properties of noble gases. Noble gases are characterized by their lack of reactivity due to having a full valence electron shell. They are nonmetals.

Step 3: Identify the elements in Group 8A. The elements in this group include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).

Step 4: Classify the elements. Since all noble gases share similar chemical properties and are nonmetals, each element in Group 8A is classified as a nonmetal.

Step 5: Conclude that any element located in Group 8A (18) is a nonmetal based on its position in the periodic table and its chemical properties.

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Key Concepts

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

Periodic Table Groups

The periodic table is organized into columns called groups, which categorize elements based on similar chemical properties. Group 8A, also known as Group 18, contains the noble gases, which are characterized by their full valence electron shells, making them largely inert and nonreactive.

Noble Gases

Noble gases are a group of nonmetals found in Group 8A of the periodic table, including helium, neon, argon, krypton, xenon, and radon. They are known for their lack of reactivity due to having a complete outer electron shell, which makes them stable and unlikely to form chemical bonds.

Classification of Elements

Elements are classified into three main categories: metals, nonmetals, and metalloids. Metals are typically conductive and malleable, nonmetals are generally poor conductors and more brittle, while metalloids exhibit properties of both. Understanding these classifications helps in identifying the nature of elements in the periodic table.