00338nam a2200133Ia 4500008004100000020001800041082001200059082001000071100001800081245003900099260001400138260004300152260000900195230118s9999||||xx |||||||||||||| ||und||  a0-07-460221-7  a541.224  bCHA/A  amanasbchanda 0aatomic structure and chemical bond  anew delhi  btata mcgrawhill publishing company ltd  c1991