Question
Tue June 12, 2012 By: Bhavna

what are periods state the correlation of periodic number with the elements of that period

Expert Reply
Thu June 14, 2012
The Modern Periodic Table has 7 horizontal rows known as periods. The atoms of different elements which have the same number of occupied shells are placed in the same period. A period indicates the principal quantum number of the outermost shell of an element. The atomic number increases by one unit on moving from left to right in a period.
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