By the promotion of one, two or three electrons from filled p-orbital to the vacant d-orbital in the valence shell, 2, 4 or 6 half filled orbitals are formed. Thus Xe can combine only with even number of fluorine and not odd.
Sunday, February 23, 2020
Why Noble gases exhibit large positive values of electron gainenthalpy?
Since noble gases have stable electronic configurations, they have no tendency to accept the electron and therefore, have large positive values of electron gain enthalpy.
Why Noble gases have very low boiling points?
Noble gases being monoatomic have no interatomic forces except weak dispersion forces and therefore, they are liquefied at very low temperatures. Hence, they have low boiling points.
Why chlorine trifluoride (ClF3) exists but fluorine trichloride (FCl3) does not?
Fluorine trichloride (FCl3) does not exist due to unavailability of d-orbitals in fluorine atom it cannot expand its valence shell. Therefore it is unable to form FCl3 whereas Chlorine has vacant d-orbitals. Hence it can promote one of the 3p electrons to the 3-d sub shell and shows +3 oxidation state and forms ClF3
Related Questions:
Hypophosphorous acid (H3PO2) and Phosphorous acid (H3PO3) act as as good reducing agents while H3PO4 does not.Why?
We know that In Hypo phosphorous acid (H3PO2) has two H atoms are bonded directly to P atom and In Phosphorous acid (H3PO3) has one H atom is bonded directly to P atom which imparts reducing character to the acid, whereas in H3PO4 there is no H atom bonded directly to P atom hence it does not have reducing character.
Related Questions:
Trisilyl amine, N(SiH3)3 is planar whereas trimethyl amines N(CH3)3 is pyramidal. Explain why?.
Why PCl3 hydrolysed while NCl3 can not be hydrolysed?
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