Hi guys this is S. Parthiban., CSIR NET (LS) 2013 AIR 39, GATE 2012, BARC OCES DGFS 2012 & 2014. I have started unit wise decoding video series for PG TRB chemistry aspirants. It will help them to understand where to read, what to read, How to read TRB oriented content. This video explains answer for few questions from periodic properties chapter.