How can period and group identified by atomic number

1.	How can period and group identified by atomic number
Answer» write the atomic no. in the fom of electronic configuration.e.g. Cl-2,8,7the no of characters is the period no.in the above case of Cl,period no. 3the no. of electrons in the last orbit tells what group is the element located.for e.g. Cl-last orbit 7 electrons so group can be calculated by:8-7=114-1=13 so the 13th group

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