Block structure-many-electron atoms, Chemistry

 

The filling of the table defined above leads to a natural division of the periodic table into blocks according to the outer electron configurations of atoms (see Fig. 2). All s block elements have configurations (ns)1 or (ns)2. In periods 2 and 3 these are followed by the p block with configurations (ns)2(np)x. Lower p block elements are same as the (n-1)d orbitals are too tightly bound to be chemically important. The p and s blocks are collectively known as

 

 

722_Untitled.png

 

Fig. 1. Showing the order of filling of orbitals in the periodic table.

 


2159_Untitled.png

 

 

Fig. 2. Structure of the periodic table, showing the s, p, d and f blocks.

 

Main groups: d-block elements of periods 4, 5 and 6 have (n-1)d and ns outer electrons, and are known as transition elements. Their configurations give some complexities as the s and d orbitals are similar in energy. The f-block elements are known as the actinides (5f) and lanthanides (4f). For ease of presentation they are usually shown as separate blocks below the main table. In the case of the lanthanides, this procedure is justified as the elements have very similar properties.

 

Posted Date: 7/21/2012 8:35:56 AM | Location : United States







Related Discussions:- Block structure-many-electron atoms, Assignment Help, Ask Question on Block structure-many-electron atoms, Get Answer, Expert's Help, Block structure-many-electron atoms Discussions

Write discussion on Block structure-many-electron atoms
Your posts are moderated
Related Questions


What is difference between silica used in TLC and HPLC column? TLC is called thin layer chromatography. The simple technique works on the principle of adsorption, where as HPLC i

Describe about the Ferromagnetic materials Ferromagnetic materials are those for which k susceptibility is large and positive. These are strongly attracted by magnetic field. I

which type of nutrition does yeast have?

Viscosity: Viscosity characterizes the motion of fluids in the presence of a mechanical shear force. All fluids can flow, and the resistance they pose to such flow is called VI

Melting and freezing points: When a pure solid substance is heated through its melting point (melting temperature), the solid changes to a liquid. At the melting point equilibr

Explain the following terms: (a) Asymmetric molecule (b) R and S notations


Boron The only nonmetallic element in group 13, boron has a strong tendency to covalent bonding. It's lonely complex structural chemistry arises from the (2 s )2(2 p )1 configur