Why is zn2 colorless

The elements of group 12 i. Interstitial compounds are those which are formed when small atoms like H, C, N, B etc. They are generally non-stoichiometric and neither typically ionic nor covalent. Most of transition metals form interstitial compounds with small non-metal atoms such as hydrogen, boron, carbon and nitrogen. These small atoms enter into the void sites between the packed atoms of crystalline transition metals and form chemical bonds with transition metals. For Example, steel and cast iron become hard by forming interstitial compound with carbon.

The existence of vacant n — 1 d orbitals in transition elements and their ability to make bonds with trapped small atoms in the main cause of interstitial compound formation. Other examples are : VH 0. Some borides of transition elements approach diamond in hardness. 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. Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C-. Write the formula for a complex formed between Zn2 and OH—, with a coordination number of 4.

What does this suggest about their electron configurations? In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all. How do you calculate the theoretical cell voltage? Which of these ions have five d electrons in the outermost d subshell?

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