activity--atoms__the_periodic_table

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					Activity--Atoms & the Periodic Table                                       Name ____Class Set______________
Physical Science
MTHS
Matthews

Directions: Answer the following questions in your lab journal. Go to the following website and scroll down until you
reach the Periodic table and Bohr Model applet. Use the applet to answer the following questions.

http://www.colorado.edu/physics/2000/applets/a2.html

(1) Click on the element Hydrogen (H). How many electrons are shown?

(2) Click on the tab labeled “Nucleus View”. How many protons are shown?

Nuclear Radius:

(3) Click on He, then Li, then Be, then B, then C etc. across the row. What happens to the size of the nucleus as you go
from left to right on the periodic table?

(4) When you click on the next row of elements does the pattern continue or restart?

(5) Explain why nuclear radius is a “non-periodic” pattern.

Electrons:

(6) Click on the tab labeled “Shell View”. If all of the “balls” you see represent electrons, what must the different colors
of the “balls” represent? Check your answer with Mr. Matthews.

(7) Click on the element Li, then Be, then B, then C, then N, then O, then F, then Ne. What happens to the number of
electrons as you moved from left to right on the periodic table?

(8) Does the pattern from # 7 “repeat” on the next row of elements? Is the “number of electrons” periodic?

Valence electrons:

(9) Click on the element Li, then Be, then B, then C, then N, then O, then F, then Ne. What happens to the number of
valence electrons as you moved from left to right on the periodic table?

(10) Does the pattern from # 9 “repeat” on the next row of elements? Is the “number of valence electrons” periodic?

(11) Click on H, Li, Na and K one after the other. Note how many “valence electrons” each element contains. Offer an
explanation for why the total number of electrons increases as you go down the column but the number of valence
electrons does not.

(12) List one periodic pattern you discovered from this activity and describe why this pattern is periodic

(13) List two non-periodic patterns you discovered from this activity and describe why they are non-periodic.

				
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