Which Follows Octet Rule?

When can you break the octet rule?

While Lewis electron dot structures help determine bonding in most compounds, there are three general exceptions: molecules in which atoms have fewer than eight electrons (boron chloride and lighter s- and p- block elements); molecules in which atoms have more than eight electrons (sulfur hexafluoride and elements ….

Why does sulfur break the octet rule?

Its structure is Here the sulfur atom has six electron pairs in its valence shell. An atom like phosphorus or sulfur which has more than an octet is said to have expanded its valence shell. This can only occur when the valence shell has enough orbitals to accommodate the extra electrons.

Why is the octet rule not universal?

Molecules having an odd number of electrons like nitric oxide, NO and nitrogen dioxide, NO2, do not satisfy the octet rule for all the atoms. Elements in the third period of the periodic table and beyond have 3d orbitals, (apart from 3s and 3p orbital) available for bonding. … This is termed as the expanded octet.

Why does BCl3 violate the octet rule?

BCl3 do not obey octet rule.It is a electron deficient molecule.As it share only three electron with chlorine atom . After forming a molecule boron has only six electrons I.e three from chlorine atom and three of its own. … Nitrogen molecule will be achieving octet by sharing three electrons.

What is the octet rule and which elements obey the octet rule?

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.

What are the 2 exceptions to the octet rule?

However, there are three general exceptions to the octet rule: Molecules, such as NO, with an odd number of electrons; Molecules in which one or more atoms possess more than eight electrons, such as SF6; and. Molecules such as BCl3, in which one or more atoms possess less than eight electrons.

Which elements can break octet rule?

There are three violations to the octet rule: odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.

Why does the octet rule exist?

The octet rule exists because the atoms of many elements become more stable by attaining a noble gas electron configuration. Most noble gases have eight valence electrons (He has only 2) which gives them a full outer shell of electrons in the s and p sublevels of their highest energy level.

What violates the octet rule?

The octet rule is violated whenever a bonded atom has either fewer or more than eight valence electrons in its valence shell. BH₃ has only six valence electrons around B. The B atom has an incomplete octet.

Does ClO2 follow octet rule?

Lewis Dot of the Chlorite Ion ClO2- In this ion, the chlorine atom does follow the octet rule, unlike ClO3−, or ClO4−.

What is Lewis octet rule?

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).

Why is the octet rule true?

Atoms will react to get in the most stable state possible. A complete octet is very stable because all orbitals will be full. … This octet can be made up by own electrons and some electrons which are shared. Thus, an atom continues to form bonds until an octet of electrons is made.