Answers

2016-04-19T17:19:40+05:30
The best way is to remember the periodic table where you can find elements in groups
for groups 1 to 4 valencies are same as group no.
for groups 5 to 8 make (8-group no.)
1 5 1
soo , we can....
i guess not
seriously say , yes or no.....
OK
then send request....