Multiple Choice
Based on molecular orbital theory, is the molecule B_2 paramagnetic or diamagnetic?
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10. Periodic Properties of the Elements
Paramagnetism and Diamagnetism
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Which of the following atoms has the most unpaired electrons?
A
Co
B
Mn
C
Ti
D
Zn
E
Fe
Verified step by step guidance1
Identify the electron configuration for each element. For example, Co (Cobalt) has an atomic number of 27, so its electron configuration is [Ar] 3d7 4s2.
Determine the number of electrons in the outermost d subshell for each element. For instance, Co has 7 electrons in the 3d subshell.
Recall that unpaired electrons are those that do not have a pair in the same orbital. In the d subshell, each orbital can hold up to 2 electrons.
Count the unpaired electrons in the d subshell for each element. For example, in Co, the 3d subshell has 5 orbitals, and with 7 electrons, there are 3 unpaired electrons.
Compare the number of unpaired electrons for each element to determine which has the most. Mn (Manganese) with an electron configuration of [Ar] 3d5 4s2 has 5 unpaired electrons, which is the highest among the given options.
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