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# Mass Number

## Numerical relationship between protons and neutrons.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Mass Number

Explains the calculation of mass number.

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• PLIX

## What is Atomic Number?

Mass Number Interactive

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• Video

## How to Determine the Atomic Number and Mass Number

Shows a lesson on atomic number and mass number, with definitions and guided examples.

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## Mass Number Quiz

Reviews how to calculate mass number.

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• Practice
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## Mass Number Practice

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To organize information and provide a visual representation that shows how factors (causes) produce an effect using a Cause and Effect Diagram.

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To increase reading comprehension, activate prior knowledge, develop collaboration and communication with peers, and determine how key vocabulary words relate to one another using Text Scan.

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• Real World Application

## Part of the Family

Reviews the relationship between atomic number and atomic mass.

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