Atomic Radius Trend Worksheet
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1
2Atomic Radius Trend
Fill in the chart below:
Period
Group
Name
# of Protons
# of Electrons
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminum
Silicon
Phosphorus
Sulfur
Chlorine
Argon
1. Think back to Bohr models. What does the period number tell you?
2. As you move across the periodic table within a period (from left to right), what happens to the numbers of protons
and electrons an atom has?
3. As you move across the periodic table within a period (from left to right), what happens to the number of energy
levels an atom has?
4. Based on your answers from question 3 and 4 above, what is happening in an atom’s nucleus and energy levels as
you move across the periodic table within a period (from left to right)?
5. Why are protons and electrons attracted to each other?
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