3 . Complex compound in which ligands are bonded at two or more points to the central atom . 4 . First metal to be discovered . 5 . ( ) n are generally referred to as ________. 9 . Study of adverse effects of chemicals on living organisms . 10 . Shape of I3- . 13 . An alloy composed of nickel and chromium , used as resistance wires . 15 . Most reactive noble gas . 16 . Former name of Radon .
3 . Complex compound in which ligands are bonded at two or more points to the central atom . 4 . First metal to be discovered . 5 . ( ) n are generally referred to as ________. 9 . Study of adverse effects of chemicals on living organisms . 10 . Shape of I3- . 13 . An alloy composed of nickel and chromium , used as resistance wires . 15 . Most reactive noble gas . 16 . Former name of Radon .