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Sulfur is in period 3 and has 6 valence electrons. The expected fluoride would be SF2, SF^ a very stable compound is surprisoing. The bonding in SF6 has been described in a number of ways- one is that there is sp3d2 hybridisation and there are 6 equivalent 2 electron 2 center bonds. Other descriptions involve resonance of ionic canonicals where the octet is preserved. Yet another description is "hypervalency" involving 3 centre bonds.

With BeH2 the situation is different, in this there are not enough electrons to form an octet. Some call this electron deficiency. In BeH2 each Be is surrounded by 4 hydrogen atoms, and there 4 BeHBe bonds- 3 center 2 electron. These are similar to bonds in B2H6.

The octet rule is a guideline- it has proved to be remarkably useful- but as someone said ".. in inorganic chemistry the rule is that there are no rules"

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Q: Why BeH2 and SF6 disobey octet rule?
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Related questions

What compound is the octet rule expanded to include 12 electrons?

SF6


Does SF2 obey octet rule?

No, SF6 doesn't. If you draw out the Lewis structure, all 6 fluorine atoms have to connect to the sulfur.


Does AsF6- obey the octet rule?

It does not. The central arsenic atom will have 6 electron domains, which means 12 valence electrons participating in bonds with the 6 fluorine atoms. This is possible because arsenic can access the 4-d sublevel of electrons, even though it doesn't have any electrons there normally. It is therefore hypervalent.


Can atoms combine less or more than the octet rule?

Yes. In the case of BeCl2 and BF3, there are only 4 and 6 electrons on Be and B respectively and not eight. Similarly, in the case of SF6 and PCl5, there are 12 and 10 electrons on S and P respectively and not eight.


A sulfur atom has 6 electrons in its outer shell how many covalent bonds is it likely to form with other atoms?

i dont no your level of chemistry, but if you know about orbital you will understand. sulfur is able to disobey the octect rule to form up to 6 bonds tis is due to the presence of d orbital. eg. SF6


What is the color of SF6?

SF6 is colorless


What is the correct formula for sulfur hexafluoride?

This chemical formula is SF6.


Is SF6 a Lewis acid or base?

Sf6 acts as an lewis acid............


What are the differences between a vacuum breaker and a SF6 gas circuit breaker breaker and a sf6 gas circuit breaker?

vcb is have vaccume and sf6 cb is filled with sf6 gas which will have good arc quencing property


What is the chemical name for compound SF6?

Sulfur Hexafluoride


What is formula for Selenium Hexafluoride?

Sulfur hexachloride is an inorganic compound consisting of two different elements. The prefix hexa indicates that there are six chloride atoms. Thus, the formula is SCl6. Note that this compound does not obey the octet rule.


What formula for sulfur hexafluoride?

F6S is the formula for Sulfur Hexafluoride.