Build An Atom Worksheet: http://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html
Instructions:
After completing
each of the following steps, fill out the
information in that row.
Name of element
Symbol
Stable?
(yes/no)
Charge
(-,0,+)
Mass
Number
Atomic
Number
Number of
Protons
Name:
Number of
Neutrons
Number of
Electrons
1. After selecting the “Symbol” icon,
drag a red proton to the yellow “X”
(nucleus)
2. Drag a gray neutron to the
nucleus.
3. Drag a blue electron to the
first orbit.
4. Add another proton to the
nucleus.
5. Add a neutron.
6. Add another neutron.
7. Add an electron.
8. Add another electron.
9. Add a proton.
10. Add another proton.
Continue to add protons, neutrons, and electrons until you feel that you understand the relationships between the columns in the table above. Then circle the correct
italicized term(s) in each sentence on the following page.
© Copyright 2014 – All rights Reserved www.cpalms.org Created By Amy D. Alford
1. The addition or removal of (protons, neutrons, electrons) causes the element name to change.
2. Atomic number is equal to the number of (protons, neutrons, electrons).
3. Atomic mass is equal to the number of (protons, neutrons, electrons) plus the number of (protons,
neutrons, electrons).
4. An atom becomes unstable when there are too many or not enough (protons, neutrons, electrons).
5. An atom becomes charged when the number of (protons, neutrons, electrons) does not equal the number
of (protons, neutrons, electrons).
6. As you add protons, what pattern do you notice about the periodic table?
A) The elements are ordered from right to left across the periodic table by increasing atomic number.
B) The elements are ordered from left to right across the periodic table by increasing atomic number.
C) The elements are ordered from right to left across the periodic table by increasing atomic mass.
D) The elements are ordered from left to right across the periodic table by decreasing atomic mass.
7. (Protons, neutrons, electrons) are found only in the nucleus of an atom. (Choose two.)
8. (Protons, neutrons, electrons) are found only in the electron cloud.
9. Only (one, two, three) electrons could fit in the first inner orbit.
10.Bonus: How many electrons can fit in the second orbit? _________
Explore the games located in the “Game” icon on the black navigation bar at the bottom
of the screen.
© Copyright 2014 – All rights Reserved www.cpalms.org Created By Amy D. Alford