Block structure-many-electron atoms, Chemistry

Assignment Help:

 

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.

 


Related Discussions:- Block structure-many-electron atoms

Explain about neutral and amphoteric oxides, Q. Explain about Neutral and A...

Q. Explain about Neutral and Amphoteric oxides? Neutral oxides have neither acidic nor basic properties and when dissolved in water, they give neutral solutions, e.g., CO, N

P block, why ionisation energy of aluminium is greater then Ga?

why ionisation energy of aluminium is greater then Ga?

D and f block, why a small amount of an acid is added while preparing solut...

why a small amount of an acid is added while preparing solution of potassium dichromate?

Wavelength of a spectral line for an electronic transition, The wavelength ...

The wavelength of a spectral line for an electronic transition is inversely related to: (1) The number of electrons undergoing the transition (2) The nuclear charge of the a

Non - ideal solutions exhibit either positive or negative, Non - ideal solu...

Non - ideal solutions exhibit either positive or negative deviations from  Roulette's law. What are these deviations and why are they caused? Explain with one example for each t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd