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 Trend: Atomic Radius (Simplified)

GOB Chemistry

2. Atoms and the Periodic Table

Periodic Trend: Atomic Radius (Simplified)

Previous problemNext problem

3:33 minutes

Problem 116b

Textbook Question

Give the symbol of the element that has the
b. largest atomic size in Period 4

Verified step by step guidance

Identify the elements in Period 4 of the periodic table. Period 4 includes elements from potassium (K) to krypton (Kr).

Recall the trend for atomic size across a period. Atomic size decreases from left to right across a period due to the increasing nuclear charge, which pulls the electrons closer to the nucleus.

Determine which element is located at the far left of Period 4. This element will have the largest atomic size because it has the fewest protons and the least effective nuclear charge pulling on its electrons.

Find the symbol of the element at the far left of Period 4. This element is potassium (K).

Conclude that the element with the largest atomic size in Period 4 is potassium (K).

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Size

Atomic size, or atomic radius, refers to the distance from the nucleus of an atom to the outermost shell of electrons. It generally increases down a group in the periodic table due to the addition of electron shells, while it decreases across a period from left to right due to increased nuclear charge, which pulls electrons closer to the nucleus.

Periodic Table Trends

The periodic table exhibits specific trends in atomic size, ionization energy, and electronegativity. In Period 4, elements are arranged in order of increasing atomic number, and understanding these trends helps predict the properties of elements, including which has the largest atomic size based on its position in the period.

Group vs. Period

In the periodic table, a group is a vertical column that contains elements with similar chemical properties, while a period is a horizontal row. Elements in the same group often have similar atomic sizes, but the largest atomic size in a specific period is typically found at the leftmost side, where the elements have fewer protons and a weaker pull on their outer electrons.

Watch next

Master Periodic Trend: Atomic Radius (Simplified) Concept 1 with a bite sized video explanation from Jules

Start learning