tag:blogger.com,1999:blog-3598104994262722367.post6086600420260921983..comments2019-03-12T21:15:23.398-07:00Comments on Ask alwaysLovely O Level A-Math,E-Math, Chemistry Questions: Chemistry Question - Periodic TablealwaysLovelyhttp://www.blogger.com/profile/06324953814968749558noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-3598104994262722367.post-20756346250774487052007-10-09T09:29:00.000-07:002007-10-09T09:29:00.000-07:00Well Done Lijun and Anonymous.Answer is indeed C.K...Well Done Lijun and Anonymous.<BR/>Answer is indeed C.<BR/><BR/>Keep up the good work!<BR/><BR/>Chem Prac in two days time.<BR/>All the Best!<BR/><BR/>Rgds<BR/>Sean<BR/>SimpleChemConcepts<BR/>"Learning Experience with A Difference"Sean Chuahttps://www.blogger.com/profile/05205017026956955312noreply@blogger.comtag:blogger.com,1999:blog-3598104994262722367.post-36370399679414563462007-10-07T05:33:00.000-07:002007-10-07T05:33:00.000-07:00C. Sodium is a metal and astatine is a non metal (...C. Sodium is a metal and astatine is a non metal (under halogens group) so they go through ionic bonding to form ionic compounds.<BR/><BR/>I'm not sure about A, so I left it out first.<BR/><BR/>B)Iodine is more reactive than Astatine, this makes it a stronger oxidising agent. I'm not sure whether this theory is right.<BR/><BR/>D)It is a diatomic molecule, but covalent bonds are strong. It's the intermolecular forces of attraction that are weak.<BR/><BR/>So by comparison, C sounds like a more logical answer than A. Do correct me if I'm wrong though.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3598104994262722367.post-14417883499923636372007-10-07T03:12:00.000-07:002007-10-07T03:12:00.000-07:00i think the answer is C.since it's below iodine, i...i think the answer is C.<BR/><BR/>since it's below iodine, it should be a solid at rtp. so it can't be A.<BR/><BR/>also, the higher the halogen in the group, the more reactive it is. so iodine should be a stronger oxidizing agent than astatine. so it's not B.<BR/><BR/>it's diatomic molecules are held together by weak van der waals forces, not weak covalent bonds. thus not D.<BR/><BR/>since it's in group VII, its ion has a charge of -1. thus will form ionic compound with sodium, which has a charge of +1. forming NaAt.lijun(:https://www.blogger.com/profile/14155170843141727089noreply@blogger.com