Table of contents

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1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

2. Atoms & Elements

Periodic Table: Group Names

General Chemistry

2. Atoms & Elements

Periodic Table: Group Names

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Multiple Choice

Why is the placement of hydrogen on the periodic table a subject of debate among scientists?

Hydrogen shares properties with both Group 1 (alkali metals) and Group 17 (halogens), making its classification ambiguous.

Hydrogen is the only element that does not form compounds with other elements.

Hydrogen has the highest atomic number in its period, which complicates its placement.

Hydrogen is the only element that is a gas at room temperature, unlike all other elements.

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Verified step by step guidance

Understand that the periodic table is organized based on elements' properties and electron configurations, grouping elements with similar chemical behaviors together.

Recognize that hydrogen has a unique electron configuration of 1s¹, which is similar to the alkali metals in Group 1 that also have a single electron in their outermost shell.

Note that hydrogen can also gain an electron to form H⁻, resembling halogens in Group 17, which typically gain one electron to complete their valence shell.

Consider that hydrogen's chemical behavior is versatile: it can lose an electron like alkali metals or gain an electron like halogens, making it difficult to place exclusively in either group.

Conclude that because hydrogen shares properties with both Group 1 and Group 17 elements, scientists debate its placement on the periodic table, as it does not fit neatly into one category.