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What are the elements in the first period

2 Answers

13 votes

Answer:

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

Step-by-step explanation:

9 votes

Answer:

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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