The BrF5 molecule has a central Br atom with the five F atoms bonded to the Br, as shown in the figure. When a Lewis structure is written for BrF5 with five Br-F single bonds, which of the following statements is or are true? 1. There are no nonbonding electron pairs on the Br atom. II. The Br atom is hypervalent. III. The formal charge on the Br atom is 0. OOO F- F F Br All three statements are true. OI and II are true. O I and III are true. O II and III are true. O Only one of the statements is true. -F F
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
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