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Biennium

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14y ago
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5d ago

Two-year periods are often referred to as bienniums.

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Q: What are two year periods called?
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What are two names for rows in the periodic table?

Periods and the vertical columns are groups


What is the purpose of scientist removing the last two periods from the periodic table?

The last two periods are called lanthanoids and actinoids. They have different properties.So, they are placed separately.


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rows. the vertical columns are called periods


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