Interactive Periodic table: http://www.rsc.org/periodic-table
Revise:
http://www.bbc.co.uk/education/guides/z84wjxs/revision
http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/periodictable/atomsrev1.shtml
http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/periodictable/group1rev1.shtml
Activity
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/rocks/atomsact.shtml
Test yourself:
http://www.bbc.co.uk/bitesize/quiz/q15739428_
http://www.bbc.co.uk/bitesize/quiz/q27719590_
http://www.sciencequiz.net/jcscience/jcchemistry/atomstruct/atomicstmc1a.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/ptable1a.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/periodictabcz2a.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/periodictabcz2b.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/periodictabcz2c.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/periodictabjm3a_smart.htm
http://www.sciencequiz.net/jcscience/jcchemistry/periodtable/periodictabjm3a.htm
http://www.sciencequiz.net/jcscience/jcchemistry/atomstruct/atomstjm3a_smart.htm
http://www.sciencequiz.net/jcscience/jcchemistry/atomstruct/atomstjm3a.htm