Question: What Is The Expanded Octet Rule?

Why does sulfur break the octet rule?

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.

An octet would be 3s23p6..

When can atoms have expanded octets?

To have an expanded octet (more than 8 electrons) you need more than 4 orbitals.

What is the octet rule simple?

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. … One way is by sharing their valence electrons with other atoms. The second way is by transferring valence electrons from one atom to another.

Can Oxygen form six bonds?

An oxygen atom can form two covalent bonds. Even though oxygen has six valence electrons, it is unable to form six covalent bonds. If oxygen formed six covalent bonds, then it would share a total of 12 electrons. Oxygen, like most other atoms, is most stable when it shares eight electrons only.

Can iodine form an expanded octet?

Iodine is below Period Two on the periodic table so it can have an expanded octet (hold more than eight valence electrons). In the Lewis structure for IF5 you’ll need to put a total of 12 valence electrons on the Iodine atom in order to draw the Lewis structure.

Does PCl3 have an expanded octet?

Originally Answered: Does PCl3 obey the octet rule? No. Yet it still is stable. In the octet, every atom must balance to 8 (or 2 if Shell-1 Hydrogen or Helium).

What does the octet rule state?

…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). When complete transfer occurs, the bonding is ionic.

What is octet rule give one example?

✔️In chemistry, the octet rule explains how atoms of different elements combine to form molecules. … In a chemical formula, the octet rule strongly governs the number of atoms for each element in a molecule. ✔️For example, calcium fluoride is CaF2 because two fluorine atoms and one calcium satisfy the rule.

Can you have an expanded octet?

The octet rule can be ‘expanded’ by some elements by utilizing the d-orbitals found in the third principal energy level and beyond. Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet.

What is the 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.

Can beryllium have an expanded octet?

Beryllium is an alkaline earth metal and so may be expected to form ionic bonds. … Since beryllium only has two valence electrons, it does not typically attain an octet through sharing of electrons.

How many electrons does hydrogen actually need around it to be happy?

That hydrogen only needs two electrons to fill its first shell to be happy like helium.

Why does bf3 not follow the octet rule?

Electron-deficient molecules. … Boron commonly makes only three covalent bonds, resulting in only six valence electrons around the B atom. A well-known example is BF 3: The third violation to the octet rule is found in those compounds with more than eight electrons assigned to their valence shell.

Are expanded octets more stable?

The course reader states that structures with an expanded octet are lower in energy. However, some of the problems in past midterms state that structures with octets are more stable.

How do you know if a octet is satisfied?

Explanation: The Octet Rule says that an atom is in its most stable state when it has a full valence shell (8 electrons in its valence shell). So, atoms take the electrons of other atoms to satisfy the Octet Rule. For example, carbon only has four valence electrons.

Why can Xenon expand its octet?

Xenon now has twelve electrons instead of the octet! This is called an “expanded octet”, expanding beyond the octet. … In the structure shown above, Xe has a formal charge of zero, so there is no reason to do any more to the structure.

Can iodine break the octet rule?

Iodine has 12 electrons around it, exceeding the common octet of electrons.

Which element Cannot have an expanded octet?

These elements include hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon. Elements that cannot have an expanded octet are: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine and neon.

Why can’t oxygen have an expanded 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.

Does oxygen follow the octet rule?

Octet rule: The concept that compounds containing carbon, nitrogen, oxygen, and fluorine are more stable if these atoms have eight valence electrons. … Every carbon, nitrogen, oxygen, and fluorine atom in this molecule has a full octet. All atoms in this molecule have a complete valence electron count.

Why are helium and hydrogen exceptions to the octet rule?

octet rule: Atoms lose, gain, or share electrons in order to have a full valence shell of eight electrons. Hydrogen is an exception because it can hold a maximum of two electrons in its valence level.

Add a comment