6.7: One More Electron Property: Electron Spin

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Paramagnetic, Diamagnetic and Ferromagnetic

Exercise \(\PageIndex{1}\)

Which of the following statements is/are CORRECT?

A paramagnetic substance is attracted to a magnetic field.
An atom with no unpaired electrons is ferromagnetic.
Atoms with one or more unpaired electrons are paramagnetic.

a. 1 only b. 3 only c. 3 only d. 1 and 3 e. 1,2, and 3

Answer: d. 1 and 3

Exercise \(\PageIndex{2}\)

Which of the following statements is/are CORRECT?

A diamagnetic substance is strongly attracted to a magnetic field.
Substances that retain their magnetism after they are withdrawn from a magnetic field are called ferromagnetic.
Most transition metals and all lanthanide metals are ferromagnetic.

a. 1 only b. 2 only c. 3 only d. 1 and 3 e. 1,2, and 3

Answer: b. 2 only

Quantum Numbers and Spin

Exercise \(\PageIndex{3}\)

What is the value of the spin quantum number for an electron in a 3d orbital?

3
2
either \(+\frac{1}{2}\) or \(-\frac{1}{2}\)
\(-\frac{1}{2}\)
\(+\frac{1}{2}\)

Answer: c. either \(+\frac{1}{2}\) or \(-\frac{1}{2}\)

Exercise \(\PageIndex{4}\)

Which of the following sets of quantum numbers (n, l, ml_, m_s) is not permissible?

2, 2, 1, \(+\frac{1}{2}\)
3, 1, 0, \(-\frac{1}{2}\)
1, 0, 0, \(+\frac{1}{2}\)
2, 1, 0, \(+\frac{1}{2}\)
4, 0, 0, \(-\frac{1}{2}\)

Answer: a. 2, 2, 1, \(+\frac{1}{2}\)

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