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how to find group number subgroup number period number and block number of any element i will teach you super easy trick through which you can crack any college or entry test question easily before starting the lecture click on the subscribe button and get access to our hundreds of unique and simple lectures for free now let me teach you the first trick when the last or better is as for example consider sodium we know that its atomic number is 11. its electronic configuration is 1s2 2s2 2p6 and 3s1 2 plus 2 plus 6 plus 1 is equal to 11. so i have successfully configured the electrons of sodium if you do not understand about the trick of electronic configuration then watch our lecture and its link is given in the description now listen carefully the last orbital is s so the block of sodium is also as the highest principal quantum number is three so the period of sodium is third there is only one electron in the last s orbital so the group number of sodium is first also remember that if
