Question
What is transition element? Explain with example.
✓
Answer
$\rightarrow$ Transition element is defined as the one which has incompletely filled d orbitals in its ground state or in any one of its oxidation states.
$\rightarrow$ Zinc, cadmium and mercury of group $12$ have full $d^{10}$ configuration in their ground state as well as in their common oxidation states and hence, are not regarded as transition metals
${ }_{30} Zn :[ Ar ] 3 d^{10} 4 s^2 \ \ \ \ \ \ Zn ^{+2}:[ Ar ] 3 d^{10}$
${ }_{48} Cd :[ Kr ] 4 d^{10} 5 s^2 \ \ \ \ \ \ Cd ^{+2}:[ Ar ] 4 d^{10}$
${ }_{80} Hg :[ Xe ] 4 f^{14} \ 5 d^{10}\ 6 s^2 \ Hg ^{+2}:[ Xe ] 4 f^{14} 5 d^{10}$
$\rightarrow$ Zinc, cadmium and mercury of group $12$ have full $d^{10}$ configuration in their ground state as well as in their common oxidation states and hence, are not regarded as transition metals
${ }_{30} Zn :[ Ar ] 3 d^{10} 4 s^2 \ \ \ \ \ \ Zn ^{+2}:[ Ar ] 3 d^{10}$
${ }_{48} Cd :[ Kr ] 4 d^{10} 5 s^2 \ \ \ \ \ \ Cd ^{+2}:[ Ar ] 4 d^{10}$
${ }_{80} Hg :[ Xe ] 4 f^{14} \ 5 d^{10}\ 6 s^2 \ Hg ^{+2}:[ Xe ] 4 f^{14} 5 d^{10}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is f-block element?
What is lanthanoid contraction? What are the consequences of lanthanoid contraction?
Write common name and IUPAC name of following alcohol compound.
Which alkyl halide from the following pairs would you expect to react more rapidly by an $\ce{S_N2}$ mechanism? Explain your answer.
$\text{CH}_3\text{CH}\text{CH}_2\text{CH}_2\text{Br}\ \text{or}\ \text{CH}_3\text{CH}_2\text{CH}\text{CH}_2\text{Br}\\\ \ \ \ \ \ \ \ \mid\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \mid\\\ \ \ \ \ \ \ \ \text{CH}_3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
→$\text{CH}_3\text{CH}\text{CH}_2\text{CH}_2\text{Br}\ \text{or}\ \text{CH}_3\text{CH}_2\text{CH}\text{CH}_2\text{Br}\\\ \ \ \ \ \ \ \ \mid\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \mid\\\ \ \ \ \ \ \ \ \text{CH}_3\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
Classify the following amines as primary, secondary or tertiary:
-
$(\text{C}_2\text{H}_5)_2\text{CHNH}_2$
-
$(\text{C}_2\text{H}_5)_2\text{NH}$
Answer the following:
(a) For a chemical reaction, what is the effect of catalyst on the rate of the reaction.
(b) Why is the probability of reaction with molecularity higher than three very rare?
(a) For a chemical reaction, what is the effect of catalyst on the rate of the reaction.
(b) Why is the probability of reaction with molecularity higher than three very rare?
How is the concept of coupling reactions useful in explaining the occurrence of non spontaneous thermochemical reactions? Explain giving an example.
Why can we not determine the order of a reaction by taking into consideration the balanced chemical equation?
Write the equations involved in the following reactions:
- Reimer - Tiemann reaction.
- Kolbe’s reaction.
How will you distinguish 1° and 2° hydroxyl groups present in glucose? Explain with reactions.