Periodic

https://en.wikipedia.org/wiki/Periodic_table

Site
http://www.ptable.com/

Conductivity
http://environmentalchemistry.com/yogi/periodic/electrical.html

Videos
http://www.periodicvideos.com/

Web
http://www.webelements.com/

Org
http://www.rsc.org/periodic-table

Gov
http://periodic.lanl.gov/index.shtml

Tube
https://www.youtube.com/results?search_query=periodic+table

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=periodic+table

https://freeglobaluniversity.blogspot.com/search/label/Mem 

https://h1ndu.blogspot.com/search/label/Periodic

arc

 https://www.google.com/search?q=electric+arc

Pitroda

 https://www.google.com/search?q=Pitroda

potting

 https://www.google.com/search?q=potting

edm

 https://www.google.com/search?q=edm

supply

 https://www.google.com/search?q=single+supply

https://www.google.com/search?q=dual+supply