Choose the best: Features of periods — task. Science State Board, Class 10.

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Choose the best answer:

1. I am the element of the second period, I have an atomic number three, to find out who am I?

Helium
Carbon
None of these
Lithium

2. I am the element of the third period, I have an atomic number eighteen, to find out who am I?

Carbon
None of these
Sodium
Argon

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