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Chemistry, 14.12.2020 22:20 naniicapri3

Why is Argon (Ar} in group 18, period 3 on the periodic table ?

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Why is Argon (Ar} in group 18, period 3 on the periodic table ? 
A.
B.
C.
D.

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Why is Argon (Ar} in group 18, period 3 on the periodic table ?

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