Why is Argon (Ar} in group 18, period 3 on the periodic table ?
A.
B.
C.
D.
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Ответ:
B
Explanation:
All elements on group 18 are noble gases, which noble gases are in fact actually not highly reactive due to the large amount of valence electrons located on the out shell.
Ответ:
I think it is Cirrus cloud according to what I studied.. I am 95% sure.