4. Identify the first-row transition metal M that satisfies the requirements given (more than one answer may be possible). Be sure to show your work. a. [M(H2O)6]3+ having one unpaired electron b. [MBr4]− having the most unpaired electrons c. diamagnetic [M(CN)6]3− d. [M(H2O)6]2+ having LFSE = −3/5Δo

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

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