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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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?

⁶⁵Zn

⁶⁵Ga³⁺

⁶⁵Zn²⁺

⁶⁵Ni²⁺

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Verified step by step guidance

Identify the number of protons in the isotope. The mass number is the sum of protons and neutrons. Given the mass number is 65 and there are 35 neutrons, subtract the number of neutrons from the mass number to find the number of protons: 65 - 35 = 30 protons.

Determine the element based on the number of protons. The atomic number, which is the number of protons, identifies the element. An atomic number of 30 corresponds to the element Zinc (Zn).

Consider the cation formation. The neutral atom of Zinc (Zn) has 30 electrons (equal to the number of protons). The cation has 28 electrons, indicating it has lost 2 electrons.

Determine the charge of the cation. Losing 2 electrons results in a 2+ charge, as the atom now has 2 more protons than electrons.

Combine the information to write the symbol of the cation. The isotope is Zinc with a mass number of 65, and it forms a cation with a 2+ charge. Therefore, the symbol of the cation is 65Zn^{2+}.