This resource turns isotopes and ions into a complete, ready to use review for Grade 9-12 chemistry, covering the same NGSS standard from three different angles.

Sample questions include "What is the average atomic mass if an element has isotopes of 28 amu (75%) and 30 amu (25%)?", "If an atom has 12 protons and 14 neutrons, what is its atomic mass?", and "What is the mass number of an isotope?"

What's Inside?

• 30 Multiple Choice questions as a separate print ready PDF worksheet
• 30 True or False questions as a separate print ready PDF worksheet
• 30 Short Answer questions as a separate print ready PDF worksheet
• Includes Answer Key with Explanations for all 90 questions
• 6 print ready PDF files, 27 pages in total

Each worksheet reviews the same core ideas from a different angle. Use them across a week or unit so students see the material three times without it ever feeling repetitive.

Ways to Use This Resource

• No prep cover lesson for a substitute teacher
• Homework or review before a test
• Bell ringers and warm ups during the unit
• First look diagnostic to plan your unit
• Review station before a lab or quiz

This set is part of a complete NGSS aligned chemistry unit. The unit also covers Atomic Structure Basics, Subatomic Particles Quiz, Electron Configuration, Periodic Table Layout, Predicting Element Properties, and Metals, Nonmetals, Metalloids, all in the same three worksheet format, so your classroom routine stays familiar while the topic changes.

Suitable for Grade 9-12 chemistry classes, and for NGSS aligned review at any point in the school year. This set is aligned to NGSS standard HS-PS1-1.