Lesson 4.3 The Periodic Table and Energy-Level Models

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1. What atom does this energy level diagram represent?

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2. What atom does this energy level diagram represent?

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3. What atom does this energy level diagram represent?

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4. How many electrons are in the first energy level?

• 1
• 2
• 4
• 8

5. Take a look at the second energy level. It is full, and can hold no more electrons. How many electrons does a full second energy level hold?

• 1
• 2
• 4
• 8

6. What element does the energy level diagram above represent? Use this periodic table to find the element.

• helium
• beryllium
• oxygen
• silicon

7. If you look down a group (a column), what do you notice about the number of electrons in the last energy level for each atom in that group?

8. The atom you are looking for has 2 electrons on the first energy level and 1 electron on the second energy level.

• helium
• lithium
• sodium
• magnesium