In P F 5,SF 6 and H 2SO4, the central atom has more than eight valence electrons hence they exhibit expanded octet. This is possible due to availability of 3d orbitals. Elements in and beyond the third period of the periodic table do not follow octet rule thus it applies mainly to the second period elements of the periodic table.
Reason Octet rule is not applicable to the second period elements of the periodic table. Assertion P F 5, S F 6 and H 2 S O 4 are the examples of expanded octet molecules.
Octet rule states that every atom tends to have eight valence electrons in its outermost shell. Significance It successfully explains the formation of chemical bonds and determine stability. Limitation It cannot be applied to non-metals after silicon as they can expand their octet. Example P Cl5 has expanded octet. Was this answer helpful?
Assertion : P F 5,SF 6 and H 2SO4 are the examples of expanded octet molecules. Reason: Octet rule is not applicable to the second period elements of the periodic table.
The expanded octet Elements in and beyond the third period of the periodic table have, apart from 3s and 3p orbitals, 3d orbitals also available for bonding. In a number of compounds of these elements there are more than eight valence electrons around the central atom. This is termed as the expanded octet. Obviously the octet rule does not apply in such cases. Some of the examples of such ...
Assertion :PF_5, SF_6 and H_2SO_4 are the examples of expanded octet ...
ReasonOctet rule is not applicable to the second period ... - Toppr