Ch. 4. PERIODICITY OF PROPERTIES OF ELEMENTS - JEE - CBSE Class XI - Revision Problems

Ch.4 Classification of Elements


http://www.geekmcq.com/chemistry/periodic-classification-of-elements-and-periodicity/

http://educationhints.blogspot.in/2013/09/mcqs-chapter-1-periodic-classification.html

http://schools.aglasem.com/58730


http://ncert.nic.in/ncerts/l/keep503.pdf