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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

Which two groups on the periodic table are considered the most reactive, and what is the primary reason for their high reactivity?

Group 2 (alkaline earth metals) and Group 18 (noble gases); both have full outer electron shells.

Group 1 (alkali metals) and Group 2 (alkaline earth metals); both have low ionization energies.

Group 3 (boron group) and Group 16 (chalcogens); both readily form covalent bonds.

Group 1 (alkali metals) and Group 17 (halogens); both have only one electron to lose or gain to achieve a stable octet.

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Verified step by step guidance

Identify the groups mentioned in the problem: Group 1 (alkali metals), Group 2 (alkaline earth metals), Group 3 (boron group), Group 16 (chalcogens), Group 17 (halogens), and Group 18 (noble gases).

Recall that reactivity in the periodic table is largely determined by how easily an element can achieve a stable electron configuration, often the octet (8 electrons) in its outer shell.

Understand that Group 1 elements have 1 electron in their outer shell and tend to lose that electron easily to achieve a full octet in the next lower energy level, making them highly reactive metals.

Recognize that Group 17 elements have 7 electrons in their outer shell and tend to gain 1 electron to complete their octet, making them highly reactive nonmetals.

Conclude that the high reactivity of Group 1 and Group 17 elements is due to their strong tendency to lose or gain one electron, respectively, to achieve a stable octet configuration.