Question

Which arrangement of electrons leads to anti ferromagnetism?

• A. $\uparrow \uparrow \uparrow \uparrow \uparrow$
• B. $\uparrow \downarrow \uparrow \downarrow$
• C. both A and B
• D. none of the above

Answer 1

The correct option is A $\uparrow \uparrow \uparrow \uparrow \uparrow$

Antiferromagnetism occurs if the alignment of moments is in a compensatory way to give zero net moment. For example, MnO. All magnetically ordered solids (ferromagnetic and antiferromagnetic solids) transform to the paramagnetic state at some elevated temperatures. This is most probably due to the randomisation of spins.

Hence, the correct option is $\text{A}$