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# Unit 1: Atoms, elements, and the periodic table

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## About this unit

Are you ready to dive into the wonderful world of chemistry? In this unit, we'll cover some of chemistry's most fundamental topics, including atoms, isotopes, ions, and the periodic table. We’ll also explore different ways of representing atoms, such as through Bohr models and Lewis diagrams.

### Learn

### Practice

- Understand: atomic structureGet 3 of 4 questions to level up!
- Apply: atomic structureGet 3 of 4 questions to level up!

### Learn

### Practice

- Understand: isotopesGet 3 of 4 questions to level up!
- Apply: isotopesGet 3 of 4 questions to level up!
- Apply: calculating average atomic massGet 3 of 4 questions to level up!
- Understand: ionsGet 3 of 4 questions to level up!
- Apply: ionsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 560 Mastery points

### Learn

### Practice

- Understand: Bohr modelsGet 3 of 4 questions to level up!
- Apply: Bohr modelsGet 3 of 4 questions to level up!
- Apply: atomic spectraGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Apply: the periodic tableGet 3 of 4 questions to level up!
- Apply: number of valence electronsGet 5 of 7 questions to level up!
- Apply: Lewis diagrams of atomsGet 3 of 4 questions to level up!
- Apply: Lewis diagrams of ionsGet 3 of 4 questions to level up!

Apply your understanding of periodic trends in this set of free practice questions aligned to NGSS standards.

### Practice

- Apply: atomic radii trendsGet 3 of 4 questions to level up!
- Apply: ionization energy trendsGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 480 Mastery points

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Level up on all the skills in this unit and collect up to 1,600 Mastery points!