What is the definition of octet rule in chemistry?

In chemical bonding: Contributions of Lewis. …are expressed by his celebrated octet rule, which states that electron transfer or electron sharing proceeds until an atom has acquired an octet of electrons (i.e., the eight electrons characteristic of the valence shell of a noble gas atom).

What is the formal definition of the octet rule?

The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds.

Why is the octet rule important?

The octet rule is important in covalent bonding because sharing electrons gives both atoms a full valence shell. All atoms strive to achieve a full valence shell, just like the noble gases. This is the most stable electron arrangement. Thus, each atom has eight valence electrons, a stable noble gas configuration.

What are examples of the octet rule?

In fact every chemical reaction is an example of the octet rule, without the tendency to form a full outer orbital, there’s no chemistry. Here are some examples: CO2, carbon forms covalent bonds with 2 oxygen so that it now has a full outer shell.

Which molecule obey the octet rule?

Sulfur can follow the octet rule as in the molecule SF 2. Each atom is surrounded by eight electrons. It is possible to excite the sulfur atom sufficiently to push valence atoms into the d orbital to allow molecules such as SF 4 and SF 6.

Which molecules can disobey the octet rule?

Having an odd number of electrons in a molecule guarantees that it does not follow the octet rule, because the rule requires eight electrons (or two for hydrogen) around each atom. The most commonly encountered stable species that exist with an odd number of electrons are nitrogen oxides , such as nitric oxide (NO) and nitrogen dioxide (NO 2 ), both of which are free radicals and disobey the octet rule.

Which are molecules disobey the octet rule?

An ion, atom, or a molecule containing an unpaired valence electron is called a free radical. These species disobey the octet rule. However, they are very unstable and tend to spontaneously dimerize.

What is the definition of octet rule in chemistry? In chemical bonding: Contributions of Lewis. …are expressed by his celebrated octet rule, which states that electron transfer or electron sharing proceeds until an atom has acquired an octet of electrons (i.e., the eight electrons characteristic of the valence shell of a noble gas atom). What…