This resource contains activities for students to practice counting the number of atoms of each element in a molecule. They will get the practice they need to become familiar with subscripts and coefficients, especially on how they impact the number of atoms counted.

This resource is designed to guide struggling students to master or review the topic with your students/class.

Students will do:

• Counting atoms with subscripts and coefficients
• Counting atoms with more than 2 elements in the compound containing polyatomic ions

This resource can be used for in-class activities and independent assessments. This is an ideal in-class activity, revision, homework, independent practice, or summer/winter break assessment.

Regardless of the grade and curriculum, our resources can be used with students doing general science, general chemistry, IGCSE Chemistry, As/A-Level Chemistry, AP Chemistry, or IB Chemistry SL/HL.

This resource includes 7 non-prep worksheets:

Counting Atoms: Coefficients and Subscripts (1 page) introduces coefficients and subscripts and how they impact the number of atoms in a molecule. They will fill in the blanks and revise counting atoms with subscripts and coefficients. It is an excellent exercise for teachers to check their students’ overall understanding.

Counting Atoms: Guided Practice (2 pages) focuses on counting the number of atoms of each element and the total number of atoms. Each page has 9 questions, with the first 6 molecules having 2 different elements and the last 3 molecules having 3 different elements. There are only subscripts used.

Counting Atoms: Independent Practice (2 pages) focuses on counting the number of atoms of each element and the total number of atoms. Each page has 9 questions, with the first 6 molecules having 2 different elements and the last 3 molecules having 3 different elements. There are only subscripts used.

Counting Atoms: Challenge (2 pages) focuses on counting the number of atoms of each element and the total number of atoms. Each page has 9 questions, with the first 6 molecules having 2 different elements and the last 3 molecules having 3 different elements. The element has been provided on the worksheets. Both subscripts and coefficients are included.

The answer key (7 pages) is provided at the end of the pack.

Relevant chemistry worksheets and activities:

• Counting Atoms in Chemical Formulas Practice Worksheet
• Balancing Chemical Equations: Easy and Medium Level Practice
• Balancing Chemical Equations: Hard & Challenge Level Practice
• Balancing Chemical Equations: 4 Difficulties Practice
• Balancing Chemical Equations: Homework, Quiz, Revision Practice
• Naming Ionic Compounds: Binary Compounds
• Naming Ionic Compounds: Ternary Compounds & Polyatomic Ions
• Naming Covalent Compounds: Naming and Writing Formulas
• Naming Ionic and Covalent Compounds Nomenclature Activities
• Identifying Types of Chemical Reactions and Balancing Equations
• Acids and Bases, Metals, & Metal Carbonates Neutralization Reactions
• Solubility Rules and Precipitation: Soluble and Insoluble Practice
• Net Ionic Equations and Precipitation: Solubility Rules and Reactions

MEGA Bundle: Chemical Reactions BIG Bundle: Writing Chemical Formulas & Balancing Equations

A SMALL BUNDLE for balancing Chemical Equations

Balancing Chemical Equations BUNDLE: Easy, Medium, Hard, Challenge Levels

A SMALL BUNDLE for Naming Ionic and Covalent Compounds

Naming Ionic and Covalent Compounds BUNDLE: Nomenclature Activities

For other chemistry worksheets, please check our page!

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