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 ten, to find out who am I?

Lithium
None of these
Hydrogen
Neon

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

None of these
Sodium
Argon
Hydrogen

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