Link to simulation: https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html
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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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Question 9
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Question 14
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Draw or take a screen shot picture from phet simulation to answer
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Review the key takeaways summary table.
Question 21
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Record 1 Got and 1 Need from this activity
Question 1
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Fill out the Table- Some parts are filled in for you
Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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Draggable item
arrow_right_alt
Corresponding Item
arrow_right_alt
arrow_right_alt
arrow_right_alt
Question 7
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Question 8
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Click on Symbol icon at bottom of the simulation page to help you fill out this chart
Draw or take a screen shot picture from phet simulation to answer.
Question 10
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Question 11
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Question 12
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Draw or take a screen shot picture from phet simulation to answer
Question 13
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Question 15
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Draw or take a screen shot picture from phet simulation to answer
Question 16
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Question 17
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Question 18
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Question 19
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Question 20
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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
there is the same number of protons and electrons
there is the same number of positive and negative charges
there is 1 proton
there is 1 electron
What changed when you added 1 neutron to the H atom model?
Element Symbol
Net Charge
Mass Number
What changed when you added 1 more electron to the H atom model?
Element Symbol
Net Charge
Mass Number
What changed when you added 1 more proton to the H atom model? (choose all that apply)
Element Symbol
Net Charge
Mass Number
Changing each particle makes... (Move around the particles on the left column so that it matches what happens when that particle changes)
Add/Remove Electrons
A new element forms
Add/Remove Protons
Same element with a different mass
Add/Remove Neutrons
Forms a charge/ion of the same element
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.
Choose all that are true
Atoms 8 and 9 have the same number of protons
Atoms 8 and 9 have the same number of nuetrons
Atoms 8 and 9 have the same number of electrons
Atoms 8 and 9 have different numbers of protons.
Atoms 8 and 9 have different numbers of neutrons.
Atoms 8 and 9 have different numbers of electrons.
Atoms 8 and 9 have the same mass number and atomic number
Atoms 8 and 9 have different atomic numbers and mass numbers
Atoms 8 and 9 have the same charge
Atoms 8 and 9 have different charges
Why is atom 9 a positive cation? Were electrons gained or lost in order to form the ion?
gained electrons
lost electrons
How would you build a negative ion (anion) for atom 12? Would you need to lose or gain electrons?
lose electrons
gain electrons
The TOP NUMBER in the symbol notation for an atom represents the atom's ________________
atomic number
mass number
The BOTTOM NUMBER in the symbol notation for an atom represents the atom's ________________
atomic number
mass number
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
cation
anion
loses
gains
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
cation
anion
loses
gains
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
