Question
Explain the trends in atomic radii of d-block elements
✓
Answer
1. The atomic or ionic radii of $3-d$ series transition elements are smaller than those of representative elements, with the same oxidation states.
2. For the same oxidation state, there is an increase in nuclear charge and a gradual decrease in ionic radii of 3dseries elements is observed. Thus ionic radii of ions with oxidation state $+2$ decreases with increase in atomic number.
3. There is slight increase is observed in $Zn ^{2+}$ ions. With the higher oxidation states, effective nuclear charge increases. Therefore ionic radii decrease with increase in oxidation state of the same element. For example, $Fe ^{2+}$ ion has ionic radius $77$ pm whereas $Fe ^{3+}$ has $65$ pm .
2. For the same oxidation state, there is an increase in nuclear charge and a gradual decrease in ionic radii of 3dseries elements is observed. Thus ionic radii of ions with oxidation state $+2$ decreases with increase in atomic number.
3. There is slight increase is observed in $Zn ^{2+}$ ions. With the higher oxidation states, effective nuclear charge increases. Therefore ionic radii decrease with increase in oxidation state of the same element. For example, $Fe ^{2+}$ ion has ionic radius $77$ pm whereas $Fe ^{3+}$ has $65$ pm .
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