Difference Between First Second and Third Transition Series

The key difference between first second and third transition series is that the outermost d orbital of first transition series elements is 3d while the outermost d orbital second transition series is 4d and the outermost d orbital in third transition series is 5d. ... Therefore, they contain different outermost orbitals.

1. What are the elements of second and third transition series?
2. Why are 1st transition series complexes mainly high spin while that of 2nd and 3rd series of low spin in Hindi?
3. Why the properties of third transition series are very similar to second transition series?
4. Why first transition series complexes are high spin and second and third transition series complexes are low spin?
5. What are the 14 transition metals?
6. What are the two series of inner transition elements?
7. Why is tetrahedral always high spin?
8. Why are tetrahedral complexes always high spin?
9. Why are D blocks called transition elements?
10. Why does the second and third series transition elements have very similar atomic radii?
11. Why are Zr and Hf the same size?
12. Why do transition elements have similar properties?

What are the elements of second and third transition series?

The second series includes the elements yttrium (symbol Y, atomic number 39) to cadmium (symbol Cd, atomic number 48). The third series extends from lanthanum (symbol La, atomic number 57) to mercury (symbol Hg, atomic number 80).

Why are 1st transition series complexes mainly high spin while that of 2nd and 3rd series of low spin in Hindi?

Answer. Answer: In addition, the pairing energy is lower in these metals because the orbitals are larger. There is more room for two electrons in one orbital, with less repulsion.

Why the properties of third transition series are very similar to second transition series?

Solution : In the third transition series after lanthanum, there is lanthanoid contraction . Due to this contraction, the size of any atom of the third transition series is almost the same as that of the element lying just above in the second transition series. This leads to similarity in their properties.

Why first transition series complexes are high spin and second and third transition series complexes are low spin?

® Compounds of 1st transition series show High spin nature , the compound of 2nd and 3rd are low spin nature . orbital produces less electronic repulsion .

What are the 14 transition metals?

Typically the elements of the post-transition metals include any metal in groups 13, 14, and 15 which are aluminum, gallium, indium, tin, thallium, lead, and bismuth.

What are the two series of inner transition elements?

The elements of f-block are also called inner transition elements. The two series of inner transition elements that are 4f and 5f series are known as lanthanoids and actinoids respectively. The inner transition elements such as U, Th and Pa are providing good sources of nuclear energy.

Why is tetrahedral always high spin?

Unlike octahedral complexes, the ligands of tetrahedral complexes come in direct contact with the d_xz, d_xy, and d_yz orbitals. Thus, these orbitals have high electron-electron repulsion, due to the direct contact, and thus higher energy. ... Because of this, most tetrahedral complexes are high spin.

Why are tetrahedral complexes always high spin?

The magnitude of crystal field splitting energy (CFSE) in tetrahedral Complexes is quite small and it is always less than the pairing energy. Due to this reason pairing of electron is energetically unfavorable. Thus all the tetrahedral Complexes are high spin Complexes.

Why are D blocks called transition elements?

The d-block elements are called transition elements because they exhibit transitional behaviour between s-block and p-block elements. Their properties are transitional between highly reactive metallic elements of s-block which are ionic in nature and the elements of p-block which are covalent in nature.

Why does the second and third series transition elements have very similar atomic radii?

The second and third transition series elements have almost similar atomic radii. It is due to lanthanoid contraction. It arises due to poor shielding effect of d and f electrons. ... This resemblance is due to the similarity in size due to the presence of lanthanoids in between it.

Why are Zr and Hf the same size?

Due to poor shielding of f-subshell, the attraction of nucleus on outer shell electrons increases and thus the size of Hf decreases and size of Zr and Hf becomes almost the same. This is the reason why both of them have similar properties.

Why do transition elements have similar properties?

The reason that that elements in the same 'group' have similar chemical properties is because they have the same number of valence electrons. ... Iron when reacting in chemical reactions loses electrons from its 4s orbital instead of its d orbital.