Level 2
Level 1

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Atomic Number 1
Hydrogen
Atomic Number 2
Helium
Atomic Number 3
Lithium
Atomic Number 4
Beryllium
Atomic Number 5
Boron
Atomic Number 6
Carbon
Atomic Number 7
Nitrogen
Atomic Number 8
Oxygen
Atomic Number 9
Fluorine
Atomic Number 10
Neon