Question

Look at sample problem 23.2. How many unpaired electrons are in (enter a number such as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) 1. Ag 2. Mn3 3. Cr3

Answer 1

1. Ag+ = No unpaired electron
2. Mn3+ = 4 unpaired electron
3. Cr3+ = 3 unpaired electron

What are unpaired electrons?

• An unpaired electron is an electron that occupies an atom's orbital single rather than as part of an electron pair.
• Each atomic orbital of an atom can hold two electrons with opposing spins.
• Because the formation of electron pairs is generally energetically advantageous, whether as a chemical bond or as a lone pair, unpaired electrons are extremely uncommon in chemistry because an entity carrying an unpaired electron is usually quite reactive.

To find the unpaired electrons:

1. Ag+ represents the d10 system. Because there are no unpaired electrons, the system is diamagnetic.
2. Mn3+ has the electronic structure [Ar]3d44s0. In 3d, there are four unpaired electrons.
3. Because of the loss of three electrons, the chromium ion Cr3+ has 24e3e=21e.

Therefore, unpaired electrons are:

1. Ag+ = No unpaired electron
2. Mn3+ = 4 unpaired electron
3. Cr3+ = 3 unpaired electron

Know more about unpaired electrons here:

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