1) Who gave the atomic theory ? a) Newton b) John Dalton c) Rutherford d) Thomson 2) The SI unit of mass is : a) Gram b) Mole c) Kilogram d) Milligram 3) The atomicity of oxygen (O2 ) is : a) 1 b) 2 c) 3 d) 4 4) Which of the following is a triatomic molecule ? a) O2 b) HCl c) H2O d) NaCl 5) Which of the following has the smallest particle size ? a) Molecule b) Atom c) Ion d) Compound

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