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

Ions (Simplified)

GOB Chemistry

2. Atoms and the Periodic Table

Ions (Simplified)

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0:52 minutes

Problem 10b

Textbook Question

Write the symbol for the ion of each of the following:
b. barium

Verified step by step guidance

Determine the group number of barium on the periodic table. Barium (Ba) is located in Group 2, which means it is an alkaline earth metal.

Recall that elements in Group 2 typically lose two electrons to achieve a stable electron configuration, resulting in a +2 charge.

Write the symbol for barium (Ba) and indicate the charge as a superscript. The ion formed by barium is Ba²⁺.

Verify the charge by considering the electron configuration. Barium has an atomic number of 56, so its neutral atom configuration is [Xe]6s². By losing two electrons, it achieves the stable configuration of [Xe].

Conclude that the symbol for the barium ion is Ba²⁺, representing a barium atom that has lost two electrons.

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Key Concepts

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

Ionic Charge

Ionic charge refers to the electrical charge that an atom or molecule carries when it gains or loses electrons. For example, when an atom loses electrons, it becomes positively charged (cation), while gaining electrons results in a negative charge (anion). Understanding ionic charge is essential for determining the symbol of an ion.

Barium

Barium is a chemical element with the symbol 'Ba' and atomic number 56. It is an alkaline earth metal that typically forms a +2 charge when it becomes an ion, as it readily loses its two outermost electrons. Recognizing the properties of barium helps in identifying its ionic form.

Chemical Symbol Notation

Chemical symbol notation is a standardized way of representing elements and their ions using one or two letters. The first letter is always capitalized, and if there is a second letter, it is lowercase. For barium, the ion symbol is written as 'Ba²⁺', indicating its +2 charge.

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Related Practice

Multiple Choice

In which pair are the two species both isoelectronic and isotopic?

Multiple Choice

One isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. The cation that this atom forms has 28 electrons. What is the symbol of the cation?

Which of the following is the symbol for the ion with a +4 charge, 30 neutrons and 21 electrons?

Fill in the gaps for the following table.

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