13Boron can expand covalency having two empty p-orbitals, thereby providing 3-unpaired eletrons fr sharing....which wud result in it having 2-electrons short frm a complete octet.
Waise bhi, monovalency won't help, 'coz a compound (even if formed) wud be highly unstable..
Bhaiya, i dunno if u wanted some other way out,this is wht i thought of at the 1st sight..
@Madhu... It aint easy to obtain a B3+ (B+ wud be easier in tht regard!)...difficult 2 fish out electrons frm the 2s...
