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





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





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
(a) Write the structural formula of 3-phenylprop-2-enal. (b) Write one chemical equation each to illustrate the following reactions: (i) Aldol condensation (ii) Cannizzaro

Explain in words why hydroboration leads to anti-Markovnikov addition of hydrogen whereas most electrophilic addtions to alkenes result in Markovnikov addition.

I am supposed to write a blanced chemical equation for Lead(II) nitrate (aq) and ammonium chloride (aq) creating a precipitate of lead(II) chloride. I wrote the unbalanced equation

why are lanthanides and actinides called innertransition metals

Q. Show the Effect of pressure on chemical equilibrium? Ans. In gases, the pressure is proportional to the number of moles of molecules. Reactions accompanied by a change

Covalent compounds are generally ...... in water: (1) Soluble                                          (2) Insoluble      (3) Dissociated       (4) Hydrolysed Ans:

plese give me awart sarni upto 200 nos

Methyl Lithium properties and uses