helium

[amit]

do helium form any compounds ,no matter how drastic the conditions are(one such example i found on wikipedia where it termed the compound as strongest acid with pKa -63!)

[insane_alien]

helium can form ionic compounds under extreme conditions but even then, they are incredibly unstable lasting only nanoseconds at most.

 

in practicality, no, He does not form any compounds.

[Darkblade48]

Well, if you can alter pressure, temperature, or even run electrical discharges through helium, etc (in essence, if you have extreme conditions) you can form compounds with helium.

[thedarkshade]

Helium is an inter gas, so it needs extreme conditions to make it react. That is because its electronic configuration is completed (1s^2) and it normally doesn't react. Also the necessary energy to "take" an electron away from helium is huge, energy which reactions cannot provide, so it's normally stable element.

[YT2095]

Xenon will form reasonably stable compounds though, as they get a little More reactive as we go down the group (the outer electrons are further away from the nucleus).

[thedarkshade]

Xenon will form reasonably stable compounds though, as they get a little More reactive as we go down the group (the outer electrons are further away from the nucleus).

 

And this increase in reactivity is due to less nucleus influence on the outer electrons, right?

Because going down the groups the number of electrons keeps increasing and also new shells are added, so the distance of the outer electrons from nucleus is also increased! So the nucleus influence on these electrons keeps decreasing down the group, and they become more reactive and less stable, right?

[YT2095]

more or less, Yup

[Riogho]

the electromagnetic pull on the electrons from the nucleus of the helium atom is too strong for it to want to share anything with anybody.

 

that is why it's electro negativity is 0

[insane_alien]

the electromagnetic pull on the electrons from the nucleus of the helium atom is too strong for it to want to share anything with anybody.

 

that is why it's electro negativity is 0

 

an electronegativity of zero would make it want to lose that electron extremely easily. much easier than say rubidium or caesium.

 

the electronegativity is actually just N/A as no data can be gathered(since it does not form any lasting compounds) on it to place it on the pauling scale.

[Riogho]

same difference