Which element in the period 2 has least mass?
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Explanation:
Lithium has the least mass, while Neon has the most mass.
Lithium:
The elements in Period 2 of the periodic table are: Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, and Neon.
Lithium has a mass of about 6.941.
Beryllium has a mass of about 9.012.
Boron has a mass of about 10.811.
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Answer:
Lithium
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