Science, asked by aditya8861, 11 months ago

__ period ( atomic number 1 to 2 ) this is the _. it contains only two elements ( hydrogen and helium )

Answers

Answered by rishitharaj47

0

Answer:

The answer is first period.

Answered by labibhussain0

1

Answer:

1st period. .this is the 1st group. it contains only two element

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