Two equivalent Lewis structures are necessary to describe the bonding in BrO4 due to the presence of multiple resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in SO3. This is because sulfur in SO3 can have different formal charges when forming bonds, leading to resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in NH4+ because nitrogen in the ammonium ion has a full octet and can form a single coordinate covalent bond with each of the four hydrogen atoms, resulting in two resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in XeO4. The central xenon atom can form two different arrangements of double bonds with oxygen atoms due to the lone pairs present on the oxygen atoms.
Two equivalent Lewis structures are needed to describe the bonding in SF4O, as the sulfur atom can have up to two different placements of the lone pair since it is surrounded by five regions of electron density.
Two equivalent Lewis structures are necessary to describe the bonding in BrO4 due to the presence of multiple resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in SO3. This is because sulfur in SO3 can have different formal charges when forming bonds, leading to resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in O3. These structures involve adding a double bond between each pair of oxygen atoms in alternate arrangements.
A single Lewis structure can be used to represent the bonding in SeF2O.
Two equivalent Lewis structures are necessary to describe the bonding in NH4+ because nitrogen in the ammonium ion has a full octet and can form a single coordinate covalent bond with each of the four hydrogen atoms, resulting in two resonance structures.
Two equivalent Lewis structures are necessary to describe the bonding in XeO4. The central xenon atom can form two different arrangements of double bonds with oxygen atoms due to the lone pairs present on the oxygen atoms.
Two equivalent Lewis structures are needed to describe the bonding in SF4O, as the sulfur atom can have up to two different placements of the lone pair since it is surrounded by five regions of electron density.
Two equivalent Lewis structures are necessary to describe the bonding in SeBr2O. This is because the central selenium atom can form two different resonance structures by moving a lone pair from the oxygen atom to form a double bond with selenium.
Two equivalent Lewis structures are necessary to describe the bonding in NO2, as it exhibits resonance. In one structure, nitrogen has a double bond with one oxygen and a single bond with another oxygen, while in the other structure, nitrogen has a double bond with the other oxygen and a single bond with the first oxygen.
Two equivalent Lewis structures are necessary to describe the bonding in PH3. In one structure, phosphorus forms three single bonds with hydrogen atoms, and in the other structure, phosphorus forms one double bond with one hydrogen and two single bonds with the remaining hydrogens to satisfy the octet rule.
1 Source: My online chemistry book.
In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory