Table of contents

1. The Chemical World9m
- The Scientific Method
  9m
2. Measurement and Problem Solving2h 19m
3. Matter and Energy2h 15m
4. Atoms and Elements2h 33m
5. Molecules and Compounds1h 50m
6. Chemical Composition1h 23m
7. Chemical Reactions1h 43m
8. Quantities in Chemical Reactions1h 8m
9. Electrons in Atoms and the Periodic Table2h 32m
10. Chemical Bonding2h 10m
11 Gases2h 7m
12. Liquids, Solids, and Intermolecular Forces1h 11m
13. Solutions3h 1m
14. Acids and Bases2h 14m
15. Chemical Equilibrium1h 27m
16. Oxidation and Reduction1h 33m
17. Radioactivity and Nuclear Chemistry53m

4. Atoms and Elements

Periodic Table: Element Symbols

Introduction to Chemistry

4. Atoms and Elements

Periodic Table: Element Symbols

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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

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Verified step by step guidance

Understand that elements are chemically similar if they belong to the same group in the periodic table, as they have similar valence electron configurations.

Identify the atomic number (Z) for each element: Z = 7 is Nitrogen (N), Z = 8 is Oxygen (O), Z = 22 is Titanium (Ti), Z = 31 is Gallium (Ga), Z = 3 is Lithium (Li), Z = 11 is Sodium (Na), Z = 32 is Germanium (Ge), and Z = 33 is Arsenic (As).

Recognize that elements in the same group have similar chemical properties. Lithium (Li) and Sodium (Na) are both in Group 1 (alkali metals), which explains their chemical similarity.

Examine the periodic table to confirm that Z = 3 (Li) and Z = 11 (Na) are indeed in the same group, while the other pairs are not.

Conclude that elements with similar chemical properties are those that share the same group in the periodic table, which is why Z = 3 and Z = 11 are chemically similar.