Use the periodictable toanswerthe followingquestions (a)Identify anelement with fiveelectrons in the outersubshell. ( b)Identifythe elementthat wouldtend to lose twoelectrons. ( c) Identifythe elementthat wouldtend to gain twoelectrons ( d)Identifythe grouphavingmetal non - metalliquid as well as gas at room temperature

Use the periodictable toanswerthe followingquestions (a)Identify anel

1.	Use the periodictable toanswerthe followingquestions (a)Identify anelement with fiveelectrons in the outersubshell. ( b)Identifythe elementthat wouldtend to lose twoelectrons. ( c) Identifythe elementthat wouldtend to gain twoelectrons ( d)Identifythe grouphavingmetal non - metalliquid as well as gas at room temperature
Answer» Solution :(a) The generalelectronicconfigurationof the elementshavingfiveelecrons in theoutersubshell is `ns^(2) np^(5)` . Thiselectronicconfigurationis CHARACTERISTIC of element of GROUP 17, i.e.,halogensand theirexamplesare F, Cl, Br,I ,At , etc. ( b)the elements whichhave atendencyto losetwo elementmust havetwoelectrons in thevalenceshell.Thereforetheirgeneralelectronicconfigurationshouldbe `n s^(2)`. Thiselectronicconfigurationis characterisitic ofgroup 2elements i.e.,alkalineearthmetalsand theirexampleare Mg ,CA, Sr, BA, etc ( c)the elementwhichhavea tendencyto accepttwo electronsmust havesixelectronicin the valence shell. thereforetheirgeneralelectronicconfiguration is `ns^(2) np^(4)` . thiselectronicconfigurationcharacteristicofgroup16 elements and theirexampleare Oand S. ( d)A metalwhich isliquidat roomtemperatureis mercury. It istransitionmetaland belongs to group 12A non- metal whichis gas itroomtemperatureishydrogen( group 1) . nitrogen (group 15) , oxygen ( group 16) , fluorinechlorine( group 17)and inertgases( group 18) . A non- metalwhich is a liquid at roomtemperatureis bromine( group 17).