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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: Representative Elements & Transition Metals

GOB Chemistry

2. Atoms and the Periodic Table

Periodic Table: Representative Elements & Transition Metals

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Multiple Choice

Which of the following is a representative element, found in the 3rd Period, that is also a pnictogen.

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Verified step by step guidance

Understand the term 'representative element': These are elements found in groups 1, 2, and 13-18 of the periodic table. They are also known as main group elements.

Identify the 3rd Period of the periodic table: The 3rd Period includes elements with atomic numbers from 11 to 18, which are Na, Mg, Al, Si, P, S, Cl, and Ar.

Define 'pnictogen': Pnictogens are elements found in Group 15 of the periodic table. This group includes nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).

Locate phosphorus (P) in the periodic table: Phosphorus is in the 3rd Period and belongs to Group 15, making it a pnictogen.

Verify the options: Among the given options (Na, P, Ar, Mg, S), phosphorus (P) is the only element that is both a representative element in the 3rd Period and a pnictogen.