Note that different VESPER families do not have the samenumber of member. For ex

Question

Note that different VESPER families do not have the samenumber of member. For exxample, the next VESPER class of theAX6 family after AX4E2 would bethe hypothetical AX3E3. This would require acentral atom with nine valence electrons to combine with threeelectrons contributed by the three X atoms to give a total of 12electrons to the central A atom.
Why would you expect AX3E3 would notexist? Note that different VESPER families do not have the samenumber of member. For exxample, the next VESPER class of theAX6 family after AX4E2 would bethe hypothetical AX3E3. This would require acentral atom with nine valence electrons to combine with threeelectrons contributed by the three X atoms to give a total of 12electrons to the central A atom.
Why would you expect AX3E3 would notexist?

Explanation / Answer

The maximum valence  available for  is 8 which are noble gases except Helium.

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