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Stels [109]
3 years ago
7

What is a period in chemistry

Biology
1 answer:
Leviafan [203]3 years ago
8 0
A period<span> is the name given to a horizontal row of the periodic table. The periodic table has seven </span>periods<span>. </span>Period<span> 1 contains only two elements: hydrogen and helium.</span>
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