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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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## Mass Number

by Sara E. Vogt //at grade
Explains the calculation of mass number.
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## 4.16 Mass Number

Explains the calculation of mass number.
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## 4.16. Mass Number

Explains the calculation of mass number.
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## 4.16 Mass Numbers

Explains the calculation of mass number.
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## Mass Number & Atomic Number

Explains the calculation of mass number.
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• PLIX

## What is Atomic Number?

Mass Number Interactive
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• Video

## Mass Number - Example 1

by CK-12 //basic
Determining the mass number from the numbers of protons and neutrons
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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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• Video

## Mass Number - Example 2

by CK-12 //basic
Determining the number of neutrons
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• Video

## Mass Number - Example 3

by CK-12 //basic
Determining number of all subatomic particles
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## Mass Number Quiz

Reviews how to calculate mass number.
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• 0
• Real World Application

## Periodic Pounds

by Hemang Mehta //basic
Periodic Mass is commonly put as 2 times the periodic number, but it is actually the periodic number plus the number of neutrons.
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• Real World Application

## Part of the Family

Reviews the relationship between atomic number and atomic mass.
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• Study Guide

## Atomic Number, Mass Number, and Isotopes

by Charles Yu //basic
A guide to atomic and mass numbers.
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