What is octet rule limitations?
One limitation of the octet rule is that it cannot be applied to the nonmetals after silicon in the Periodic Table. These elements can “expand their octet” and have more than eight valence electrons around the central atom. Molecules with an odd number of electrons such as NO and NO2 cannot satisfy the octet rule.
What are two limitations of octet rule?
(1) Hydrogen with 1 electron attains stability by sharing, gaining or losing 1 valence electron. It does not need to complete octet to attain stability. Also, He has only 2 electrons and is stable.
What was the octet rule Why did it fail?
Failure of octet rule : There are number of stable molecules known in which the octet rule is violated that is atoms in these molecules have number of electrons in the valency shell either short of octet or more than octet. BeF2, BF3, AlH3 are electron- deficients (Octet incomplete) hence are Lewis acid.
Why can’t oxygen expand its octet?
Oxygen has no empty orbitals with it . It only possess orbitals upto 2p which contains 4 electrons. So it cannot expand its octet by exiting it’s electrons.
Why is sulfur so reactive?
Because sulfur is much less electronegative than oxygen, it is more likely to form compounds in which it has a positive oxidation number (see table below). In theory, sulfur can react with oxygen to form either SO2 or SO3, whose Lewis structures are given in the figure below.
Is Sulfur more reactive than chlorine?
Chlorine is more reactive because it only needs to lose one electron to make it stable and sulphur needs to lose two to become stable. Thus, chlorine is more reactive than sulphur .
Why Oxygen is a gas whereas Sulphur is a solid?
The intermolecular forces in oxygen are weak van der Waals forces, which causes it to exist as gas. On the other hand, sulphur does not form strong S=S double bonds hence exists as a puckered structure held together by strong covalent bonds and exists as a polyatomic molecule. So, it exists as a solid.
What is the word equation for Sulphur and oxygen?
Revision questions
| Word equation | sulfur + oxygen → sulfur dioxide |
|---|---|
| Chemical equation | S + O2 → SO2 |
| Picture equation |