February 2019 1 63 Report
Ion berikut ini, manakah yang mempunyai elektron lebih banyak daripada proton dan
lebih banyak proton daripada neutron? [H = 1 1H; D = 2 1H; He 4 2He; O 16 8O]
A. D-
D. OD
B. D3O+
E. OH
C.He+
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