Atomic Structure

By: Connor Huggins Pg. 5

Subatomic Particles in a Neutral Atom

  1. Find the Atomic Number on the periodic table
  2. Use Calcium as an example with an atomic number of 20
  3. Protons and Electrons are the same as the atomic number
  4. To find the number of Neutrons find the difference between the mass number and the atomic number


An atom or molecule with a net electric charge due to gain or loss of one or more electrons


Number of both Protons and Neutrons in the nucleus is the atoms mass number and each isotope in an element has a different mass number. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.

The element name or symbol followed with a hyphen and the mass number.

In Isotope Notation you can quickly show how many protons, neutrons, and electrons are in an atom.

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