The Atom

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The Atom
You will need to use your textbook to make this part of your wiki (pg. 311 - 317)


  • Atom: the smallest particle into which an element of all the naturally occurring isotopes of an element.
  • Element: a pure substance that cannot be separated or broken down into simpler substances by physical or chemical means.

What's Inside of an Atom:
  • Draw a diagram of what an atom looks like (use pg. 312) as a guide
    • label all the parts
    • Write a description of each labeled part


Building an Element:
  • The proton helps you identify the elements inside the atom. Another name for the proton is atomic number.
  • There are no charge in an atom because a positive and negative together equal zero which is no charge.
  • Complete the table
Atomic #
# of Protons
Carbon 6 6
Chlorine 17 17
Silver 79 79
Potassium 19 19

  • Isotopes: (define it, then come up with 3 statements about isotopes)
    • Atoms that have the same number of protons but have different numbers of neutrons.
    • Atoms that are isotopes of each other are always the same element because the number of protons in each atom is the same.
    • All 3 isotopes are colorless, odorless gases at room temperature.
    • You can identify each isotope of an element by its mass number.

  • Identifying Isotopes:
    • How can you identify each isotope of an element? By its mass number.
    • What is a mass number? A mass number is the sum of the protons and neutrons in an atom.


  • Using the drawings from figure 15 on page 315 as a guide, you will be:
    1. Drawing isotopes of different elements (make sure to color code protons, neutrons, and electrons)
    2. Calculate the mass number
    3. Identify the number of electrons inside the atom if the atom is neutral (no charge)
# Protons: 2
# Neutrons: 1
# Electrons: None
Mass number: 3
# Protons: 2
# Neutrons: 2
# Electrons: None
Mass Number: 4

# Protons: 4
# Neutrons: 3
# Electrons: 1
Mass number: 7
# Protons: 4
# Neutrons: 5
# Electrons: None
Mass Number: 9

Concept Map:

  • Create a concept map of the atom, using Inspiration or word and Insert it below.  The concept map should include: atom, nucleus, protons, neutrons, electrons, isotopes, atomic number, mass number


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