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1
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2
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- Fifty-five
- 1. mass
- 2. number
- Periods; groups
- 1. representative
- 2. transition
- 3. metal
- 4.
- 5. metalloid
- 6. name
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3
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- Active
- 1. Alkali metals
- 2. Alkaline earth metals
- metals; nonmetals, metalloids
- 1. boron family
- 2. carbon group
- a. Living things
- b. Semiconductors
- c. Lead
- 3. nitrogen group
- 4. oxygen family
- 5. halogen group
- 6. noble gases
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4
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- Groups 3-12
- 1. iron triad
- 2. catalysts
- inner
- 1. lanthanides
- 2. actinides
- 3.
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