EasyChemistryHigh School (11–12)The p-Block ElementsNumericalConceptual

For each interhalogen compound, the central halogen has 7 outer electrons and uses one for each…

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For each interhalogen compound, the central halogen has 7 outer electrons and uses one for each bond. Find the number of lone pairs on the central atom of ClF3 and of BrF5, and of ICl. Find the steric number of IF7. Then name the shape of each of the four compounds.

Need a reminder? The key ideaShow

In an interhalogen compound or a xenon compound, count the lone pairs on the central atom. The number is the outer electrons minus the electrons used in bonds, divided by 2. The steric number is the bonded atoms plus the lone pairs. A weak acid with constant $K_a$ and concentration $c$ gives $[\text{H}^+] = x$ with $\dfrac{x^2}{c - x} = K_a$ , and $\text{pH} = -\log_{10} x$ .

The worked solution

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