Single Choice

Which of the following ions contains minimum number of unpaired electrons?

A$$Fe^{2+}$$
B$$Fe^{3+}$$
C$$Co^{2+}$$
Correct Answer
D$$Co^{3+}$$

Solution

Ion Atomic number
outer electronic configuration
Number of unpaired electrons
$$ Fe^{2+} $$ 26
$$ 3d^6$$ 4
$$ Fe^{3+}$$ 26 $$ 3d^5$$ 5
$$ Co^{2+}$$ 27 $$ 3d^7$$ 3
$$ Co^{3+}$$ 27 $$ 3d^6$$ 4
Hence, option $$C$$ is correct.

SIMILAR QUESTIONS

Atomic Structure

Which of the following statements is/are incorrect?

Atomic Structure

If Hunds rule is applicable, $$p^3$$ configuration is $$\upharpoonleft$$ $$\upharpoonleft$$ $$\upharpoonleft$$ because in this arrangement:

Atomic Structure

The first ionisation potential in electron volts of nitrogen and oxygen atoms are, respectively, given by :

Atomic Structure

Identify the least reactive element from the following.

Atomic Structure

According to Bohr - Bury scheme, the maximum number of electrons which can be accomodated in a given shell is given by the formula:

Atomic Structure

The stability of ferric ion is due to:

Atomic Structure

Answer the following: The $$+3$$ oxidation state of lanthanum $$(Z=57)$$, gadolinium $$(Z=64)$$ and lutetium $$(Z=71)$$ are especially stable.

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to (i) atomic structure, (ii)electrical state

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to chemical action

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to toxicity.

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