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: Group Names

GOB Chemistry

2. Atoms and the Periodic Table

Periodic Table: Group Names

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1:05 minutes

Problem 95c

Textbook Question

Complete the following statements:
c. Sodium and potassium are examples of elements called _____.

Verified step by step guidance

Identify the periodic table group to which sodium (Na) and potassium (K) belong. Both are located in Group 1.

Understand that elements in Group 1 are known as alkali metals. This group includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Recall the properties of alkali metals: they are highly reactive, especially with water, and they form +1 ions in chemical reactions.

Note that alkali metals are characterized by having a single electron in their outermost shell, which makes them very reactive.

Conclude that sodium and potassium are examples of elements called alkali metals.

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Key Concepts

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

Alkali Metals

Sodium and potassium belong to the group of elements known as alkali metals, which are found in Group 1 of the periodic table. These metals are characterized by their high reactivity, especially with water, and they typically form strong bases when reacting with acids. Alkali metals have one electron in their outermost shell, which they readily lose to form positive ions.

Periodic Table

The periodic table is a systematic arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties. Elements are organized into rows (periods) and columns (groups), with alkali metals located in the first column. Understanding the periodic table is essential for predicting the behavior of elements and their compounds.

Chemical Reactivity

Chemical reactivity refers to the tendency of a substance to undergo chemical changes, which can involve the formation of new substances. For alkali metals like sodium and potassium, reactivity increases down the group, meaning that cesium is more reactive than sodium. This property is crucial for understanding how these elements interact with other substances, particularly in biological and industrial processes.

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Related Practice

Textbook Question

Identify the group or period number described by each of the following:

a. contains C, N, and O

1242

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Textbook Question

Using TABLE 4.4, identify the function of each of the following in the body and classify each as an alkali metal, an alkaline earth metal, a transition element, or a halogen:

b. Cu

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Textbook Question

Use the following blank periodic table to show where the elements matching the following descriptions appear.

a. Elements with the valence-shell electron configuration ns² np⁵

b. An element whose third shell contains two p electrons

c. Elements with a completely filled valence shell

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Textbook Question

Juan added the following elements to the soil to improve potato production. Identify the group and period for and classify each as an alkali metal, an alkaline earth metal, a transition element, or a nonmetal:

b. Cu

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Textbook Question

Complete the following statements:

b. The elements in Group 7A (17) are called the _____.

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Multiple Choice

Which of the following is a metalloid that is also a chalcogen?