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

Periodic Table: Element Symbols

GOB Chemistry

2. Atoms and the Periodic Table

Periodic Table: Element Symbols

Previous problemNext problem

Struggling with GOB Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Based on the number of protons each element has, which would you expect to be chemically similar?

Z = 7 and Z = 8

Z = 22 and Z = 31

Z = 3 and Z = 11

Z = 32 and Z = 33

Previous problemNext problem

Verified step by step guidance

Understand that elements are chemically similar if they belong to the same group in the periodic table. Elements in the same group have similar valence electron configurations, which leads to similar chemical properties.

Identify the atomic number (Z) of each element. The atomic number corresponds to the number of protons in the nucleus of an atom, which determines the element's identity.

Locate each element on the periodic table using its atomic number. For example, Z = 7 corresponds to nitrogen (N), Z = 8 to oxygen (O), Z = 22 to titanium (Ti), Z = 31 to gallium (Ga), Z = 3 to lithium (Li), Z = 11 to sodium (Na), Z = 32 to germanium (Ge), and Z = 33 to arsenic (As).

Check the group number for each element. Elements in the same group will have similar chemical properties. Lithium (Z = 3) and sodium (Z = 11) are both in Group 1, known as the alkali metals, which are chemically similar.

Conclude that elements with Z = 3 and Z = 11 are chemically similar because they are both alkali metals in Group 1, sharing similar chemical properties due to their single valence electron.