Why zn2 colorless

In transition elements, there are greater horizontal similarities in the properties in contrast to the main group elements because of similar ns 2 common configuration of the outermost shell. This means that after scandium, d-orbitals become more stable than the s-orbital.

In 2nd half of first row transition elements, electrons starts pairing up in 3d orbitals. A group of fourteen elements following lanthanum i. In these elements, the last electron enters the 4f-subshells pre pen ultimate shell. It may be noted that atoms of these elements have electronic configuration with 6s 2 common but with variable occupancy of 4f level.

These elements constitute one of the two series of inner transition elements or f-block. Lanthanoid contraction: In the lanthanoide series with the increase in atomic number, atomic radii and ionic radii decrease from one element to the other, but this decrease is very small. The regular small decrease in atomic radii and ionic radii of lanthanides with increasing atomic number along the series is called lanthanoid contraction.

Cause of lanthanoid contraction: When one moves from 58 Ce to 71 Lu along the lanthanide series nuclear charge goes on increasing by one unit every time. Simultaneously an electron is also added which enters to the inner f subshell. The shielding effect of f-orbitals in very poor due to their diffused shape.

It results in the stronger force of nuclear attraction of the 4f electrons and the outer electrons causing decrease in size. Consequences of lanthanoid contraction: i Similarly in the properties of elements of second and third transition series e.

This resemblance is due to the similarity in size due to the presence of lanthanoids in berween. The important characteristics of transition metals are: i All transition elements are metallic in nature, e.

The presence of partially filled d-orbitaIs in the electronic configuration of atomic and ionic species of these elements is responsible for the characteristic properties of transition elements. They are called transition elements because of their position in the periodic table. Therefore, its salts are colourless. Therefore, its salts are coloured. Children Day celebration in India begins.

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CBSE has released the term-1 admit card Share This Video. Apne doubts clear karein ab Whatsapp par bhi. The vast majority of simple inorganic e. Transition metal compounds are often colored because of transitions of electrons between d-orbitals of different energy.

Zinc is colourless because its electronic configuration is 3d10 4s2 so there last orbital is full filled so its magnetic behaviour is diamagnetic and zinc is colourless. Skip to content. Search for:.