What is octet rule Class 9?
The octet rule refers to an important principle that the atoms which have bonded share eight outer electrons. This certainly means that the atom’s valence shell has a resemblance with a noble gas. The octet rule states that the atoms like to have eight electrons only in their full outer shells.
Which elements have an expanded octet?
Sulfur, phosphorus, silicon, and chlorine are common examples of elements that form an expanded octet. Phosphorus pentachloride (PCl5) and sulfur hexafluoride (SF6) are examples of molecules that deviate from the octet rule by having more than 8 electrons around the central atom.
Is BrF5 Super octet molecule?
For the BrF5 Lewis structure the total number of valence electrons (found on the periodic table) is 42. Note that in the Lewis structure for BrF5, Bromine (B) is in Period Four on the periodic table. This means it can hold more than eight valence electrons. This is called an expanded octet.
What is doublet rule?
Duplet Rule Explained Duplet rule states that an element is stable if its atom has 2 electrons in its valence shell and to attain this state, elements lose, gain or share electrons and form chemical bonds.
Why do helium has zero valency?
Helium has one shell (k) which requires two electrons and helium has two-electrons so the outermost shell is filled and helium has no need to lose electrons or gain electrons. Therefore the valency of helium is taken as zero.
What is an expanded octet?
Expanded octet (hypervalent): A valence shell electron count that exceeds eight electrons. In phosphate ion (PO43-), each oxygen has a full octet (eight valence electrons), whereas phosphorus has an expanded octet (ten valence electrons).
Can I have an expanded octet?
To have an expanded octet (more than 8 electrons) you need more than 4 orbitals. This means that you need to start using d-orbitals, and those are only available for atoms in the third period or below (So atoms in the third period or greater can have expanded octets.
Is if7 Super octet?
\[I{{F}_{7}}\] : Iodine heptafluoride has the molecular formula \[I{{F}_{7}}\]. Its outermost shell shares seven of its electrons with one electron from seven fluorine atoms. Therefore, the total number of electrons in the outermost shell of the central atom is 14 and hence a super octet molecule is produced.
Is SF6 Super octet?
(1) SF6 (2) PCl5 (3) IF7 (4) All of these. In all of these the central atom has more than eight electrons and is therefore superoctet.
What does the term duplet mean?
Definition of duplet : two musical notes played in the time of three of the same value — compare triplet.
What is duplet and octet state?
The key difference between octet and duplet is that octet is an atom or an ion having a maximum of eight electrons in the outermost shell while duplet is an atom having the maximum of two electrons in the outermost shell.