Acknowledgements
http://www.rsc.org/chemistryworld/2013/11/what-chemistry-peter-atkins
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch3/index.php#isotopes
http://www.jdenuno.com/Chem4~Prob.htm
http://blog.tutorvista.com/2011/12/acids-and-bases/
http://www.google.com/search?q=periodic+table&safe=active&rlz=1C1KMZB_enUS558US558&espv=210&es_sm=93&source=lnms&tbm=isch&sa=X&ei=8H_MUo-CCIyihgfz74DIAw&sqi=2&ved=0CAcQ_AUoAQ&biw=1024&bih=676&surl=1#facrc=_&imgdii=_&imgrc=EA4l9XrZF-BZwM%3A%3Bgc7i6bzmNkroiM%3Bhttp%253A%252F%252Foxford-labs.com%252Fwp-content%252Fuploads%252F2009%252F04%252Fperiodic-table.jpg%3Bhttp%253A%252F%252Foxford-labs.com%252Fx-ray-fluorescence%252Fthe-periodic-table%252F%3B1635%3B1200