(A)The Phase Diagram of Helium Has ____ Triple Points

question 122

Essay

(a)The phase diagram of helium has ____ triple points.
(b)The ionization energy of both oxygen and xenon is about 1200 kJ.mol^-1.
What does this observation suggest?
(c)The first noble gas compound actually contained the XeF⁺ ion.
Write the Lewis structure of this ion and predict whether it should be stable.

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