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2.4 Build an Atom Phet Simulation

Last updated over 3 years ago
21 questions
Link to simulation: https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html
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Fill out the Table- Some parts are filled in for you

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Note: Look at the question and directions on the left column for #2 and then answer the question.

Why is the H, hydrogen, atom neutral (no charge)? Select all that are true

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What changed when you added 1 neutron to the H atom model?

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What changed when you added 1 more electron to the H atom model?

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What changed when you added 1 more proton to the H atom model? (choose all that apply)

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Changing each particle makes... (Move around the particles on the left column so that it matches what happens when that particle changes)

Draggable itemCorresponding Item
Add/Remove Protons
A new element forms
Add/Remove Neutrons
Same element with a different mass
Add/Remove Electrons
Forms a charge/ion of the same element
Atomic Number= Is the identity of an element. If you change this, then you cange what the atom is.

Mass Number = Represents the mass of the atom. It comes from the particles that are located in the dense nucleus in the center of the atom.

An atom becomes charged or an ion forms when an atom is no longer neutral because the number of protons does not equal the number of electrons.
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Move the choice to each category that makes the statement true

  • Electrons
  • Neutrons
  • Protons
  • Atomic Number is the number of __________.
  • Mass Number is the number of protons + _______________.
  • An ion (charge) forms when __________ are added or removed from the atom.
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Click on Symbol icon at bottom of the simulation page to help you fill out this chart

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Draw or take a screen shot picture from phet simulation to answer.

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Choose all that are true

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Why is atom 9 a positive cation? Were electrons gained or lost in order to form the ion?

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Draw or take a screen shot picture from phet simulation to answer

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How would you build a negative ion (anion) for atom 12? Would you need to lose or gain electrons?

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Draw or take a screen shot picture from phet simulation to answer

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Draw or take a screen shot picture from phet simulation to answer

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The TOP NUMBER in the symbol notation for an atom represents the atom's ________________

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The BOTTOM NUMBER in the symbol notation for an atom represents the atom's ________________

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A POSITIVE ION is called a ____________________ (cation, ion) and occurs when an atom ______________ (loses, gains) electrons. Choose the two correct terms to fill in blanks

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A NEGATIVE ION is called a ____________________ (cation, ion) and occurs when an atom ______________ (loses, gains) electrons. Choose the two correct terms to fill in blanks

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An ISOTOPE occurs when an element has a different ____________ (atomic number, mass number) because the number of _______________ (protons, neutrons, electrons) are different. Choose the two correct terms to fill in blanks

Review the key takeaways summary table.
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Record 1 Got and 1 Need from this activity