Division of periodic table into blocks
periodic table has been classified into 4 blocks
S block P block d block f block
The division depends upon the type of atomic orbital .which receive the valence electron.
for eg. Mg the valence electron enter the s orbital .so Mg belongs to s block.
S block : it is present in the L. H. S of the periodic table .in all these elements the valence electron enter the s- orbital. so they are called s block elements. so s block consistint of 2 groups
group (1) elements are called alkali metals
for eg. Li, Na
group (2) elements which soluble in water than formed hydroxide and form alkali. for eg. berillium, magnesium etc
Electronic configurations of s block elements
(ns^1-2)
P block: it is present in the R. H. S of the periodic table. in all these elements the valence electron enter p orbital. so they are called p block elements .
group 13 - 18 consisting p orbital
General electronic configuration of p block elements: ns^2 np^1-6
d block: it is present in the middle of periodic table .in all these elements the valence electron enter in the d orbital of plantivalent shell (n-1)
group 3-12 consisting d block elements are also called transition elements because they show transistion I property from highly +ve electron of s block to least + ve electron of p block elements.
general electronic configuration of d block elements ns^1-2 (n-1) d^1-10.
coinage metals cu, Ag, Au.
zn, CD, Ag not transistion element because not completely filled d subshell.
F block: It is present at the bottom of periodic table. In all these elements the valence electron enter the f orbital of antiplantivalet shell (n-2).
f block elements are also called inner transistion element because they consist series with in transistion series f block consists two inner transistion series called lanthanoids and Actinoids.
the elements Ce-Lu which follow lanthanum are called lanthanoids
the elements Th-Lr which follow Actinum are called Actinoids.
the elements which follow uranium are called
Uranide
eg. thorium.
general electronic configuration of f block elements ns^2 (n-1) d^0-1 (n-2) f^1-14.
periodic table has been classified into 4 blocks
S block P block d block f block
The division depends upon the type of atomic orbital .which receive the valence electron.
for eg. Mg the valence electron enter the s orbital .so Mg belongs to s block.
S block : it is present in the L. H. S of the periodic table .in all these elements the valence electron enter the s- orbital. so they are called s block elements. so s block consistint of 2 groups
group (1) elements are called alkali metals
for eg. Li, Na
group (2) elements which soluble in water than formed hydroxide and form alkali. for eg. berillium, magnesium etc
Electronic configurations of s block elements
(ns^1-2)
P block: it is present in the R. H. S of the periodic table. in all these elements the valence electron enter p orbital. so they are called p block elements .
group 13 - 18 consisting p orbital
General electronic configuration of p block elements: ns^2 np^1-6
d block: it is present in the middle of periodic table .in all these elements the valence electron enter in the d orbital of plantivalent shell (n-1)
group 3-12 consisting d block elements are also called transition elements because they show transistion I property from highly +ve electron of s block to least + ve electron of p block elements.
general electronic configuration of d block elements ns^1-2 (n-1) d^1-10.
coinage metals cu, Ag, Au.
zn, CD, Ag not transistion element because not completely filled d subshell.
F block: It is present at the bottom of periodic table. In all these elements the valence electron enter the f orbital of antiplantivalet shell (n-2).
f block elements are also called inner transistion element because they consist series with in transistion series f block consists two inner transistion series called lanthanoids and Actinoids.
the elements Ce-Lu which follow lanthanum are called lanthanoids
the elements Th-Lr which follow Actinum are called Actinoids.
the elements which follow uranium are called
Uranide
eg. thorium.
general electronic configuration of f block elements ns^2 (n-1) d^0-1 (n-2) f^1-14.
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