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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2:39 minutes

Problem 12a

Textbook Question

Identify each of the following elements as a metal, a nonmetal, or a metalloid:
a. located in Group 2A (2)

Verified step by step guidance

Step 1: Understand the periodic table structure. The periodic table is divided into groups (vertical columns) and periods (horizontal rows). Group 2A (2) is also known as the alkaline earth metals group.

Step 2: Recall the classification of elements. Elements are classified as metals, nonmetals, or metalloids based on their physical and chemical properties. Metals are typically shiny, malleable, and good conductors of heat and electricity. Nonmetals are generally dull, brittle, and poor conductors. Metalloids have properties intermediate between metals and nonmetals.

Step 3: Identify the elements in Group 2A (2). The elements in this group include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Step 4: Determine the classification of these elements. All elements in Group 2A (2) are metals because they exhibit metallic properties such as high conductivity, malleability, and the ability to form positive ions.

Step 5: Conclude that any element located in Group 2A (2) is classified as a metal based on its position in the periodic table and its 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 2A, also known as Group 2, contains alkaline earth metals, which are characterized by having two electrons in their outermost shell. Understanding the properties of elements in this group is essential for identifying their classification as metals.

Metals

Metals are elements that typically exhibit high electrical and thermal conductivity, malleability, ductility, and a shiny appearance. They are usually solid at room temperature (with the exception of mercury) and tend to lose electrons during chemical reactions, forming positive ions. Recognizing these characteristics helps in classifying elements accurately.

Element Classification

Elements are classified into three main categories: metals, nonmetals, and metalloids. Metals are generally found on the left side and in the center of the periodic table, while nonmetals are located on the right. Metalloids possess properties of both metals and nonmetals and are found along the zig-zag line that separates the two categories. This classification is crucial for understanding the behavior and reactivity of elements.