4.1.7

Proton and Nucleon

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Proton and Nucleon Numbers

Proton numbers and nucleon numbers tell us information about atoms.

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Proton number (Z)

  • The number of protons in a nucleus tells us what element an atom is.
  • For example, hydrogen atoms always have 1 proton.
Illustrative background for Mass number (A)Illustrative background for Mass number (A) ?? "content

Mass number (A)

  • The mass number is the total number of protons and neutrons in a nucleus.
  • Atoms of the same element can have different numbers of neutrons.
  • For example, hydrogen can have 0, 1 or 2 neutrons.

Jump to other topics

1Energy

2Electricity

3Particle Model of Matter

4Atoms & Radiation

5Forces

5.1Basics of Motion

5.2Forces

5.3Effects of Forces

5.4Pressure

6Waves

7Magnetism

8Astrophysics

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