How to identify the group and period of element ?
Electronic configuration is the arrangement of electrons in an atom in different shells and sub-shells. The modern periodic table has elements arranged according to their electronic configurations.From left to right i.e. in a period,the arrangment is such that each subsequent electron added is to the same shell. Electronic Configuration is the Period e.g Configuration of Li atomic number. 3, is 1s2 ,2s1 Configuration of Be atomic no. 4, is 1s2 ,2s2 Configuration of B atomic no. 5, is 1s2 ,2s2,2p1 Configuration of C atomic no. 6, is 1s2 ,2s2 ,2p2 and so on till Neon,the last element. This addition of each subsequent electron results in a completely new configuration and as such the chemical properties of the subsequent element change gradually..At the end of each row, a drastic shift occurs in chemical properties. Electronic Configuration is the Group From top to down in a column,i.e.in a group, each subsequent electron is added to the new shell,but in same sub-shell. e.g. In the 1st group, Configuration of H atomic number.1,is 1s1 Configuration of Li atomic no. 3, is 1s2 ,2s1 Configuration of Na atomic no. 11, is 1s2 ,s2,2p6 ,3s1 Configuration of K atomic no. 19, is 1s2 ,2s2 ,2p6,3s2 ,3p6,4s1 and so on till Neon,the last element. The number of valence shell electrons in an atom would determine the way it will interact with other atoms, and therefore determine its chemical properties. Further study visit10th Periodic Classification of Elements (10 pages)
1 Comment
nishi shrama
19/2/2012 02:30:36 am
very much helpful for me and my friends
Reply
Leave a Reply. |
Blog SeaRCH Link
All
Join Us For Update |