An inert gas X is used to fill weather balloons.
Which descriptions of X are correct?
number of outer electrons in atoms of X: 2 / structure of gas X: single atoms
2 )
number of outer electrons in atoms of X: 2 / structure of gas X: diatomic molecules
3 )
number of outer electrons in atoms of X: 8 / structure of gas X: single atoms
4 )
number of outer electrons in atoms of X: 8 / structure of gas X: diatomic molecules
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