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Nickolay Kondratyev · Answer 1 · 2022-01-17T22:27:16+0000

Answer:

"Hydrogen and Helium". Hydrogen and Helium are the elements of the first period in the modern periodic table.

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Mightypile · Answer 2 · 2022-01-23T02:59:01+0000

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Step-by-step explanation:

There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure.

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