how to find the group number in modern peridic table
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in modern periodic table GROUP NUMBER refers to the number of electrons in the valence shell of an element..
e.g Helium has 7 electrons in its valence shell so it is placed in group No 7..Similarly Na has 1 electron in its valence shell so it is placed in group 1
e.g Helium has 7 electrons in its valence shell so it is placed in group No 7..Similarly Na has 1 electron in its valence shell so it is placed in group 1
machu2003:
thanks but please could you explain me for aluminium
Al has atomic number 13.it accomodates 2 electron in first shell,8 in second and 3 in last shell.as its valence shell has 3 electrons it is placed in group no 13
we cant say it will be placed in group 3..bcz group no 1,2. 13 to 18 are main group elements while 3 to 12 are transition elements.
hope you,ll understand now!
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