The to b Cheaustry Assignment for Grade 9th B 10% 1. From the primary fundamental Sub Particles in an atom, which is the Lightest in mass? A. Flectron B. Proton C, neutron O-nucleus. 2. Compared to the charge and mass of a proton an ele ctron has A. The same charge and smaller mass B, The Same charge and the same mass an opposite charge and the Same mass an opposite charge and smaller mass 3, which of the following statements of Dalton's atomic theory is no longer the according to the modern atom: theory? A, Elements are made up of tony particles Called abo B. Atoms are neither created nor destroyed in chemical rxns. e, All Atoms of a given element are identica D. Atoms can Subdivided further 4, which of the following models of an atom resemble the Planetary system A, Bohr's model B. Ruther fords model C. Thomson's model o. Dalton's model 5, which one of the following observation in the alpha particles Scattering experiment led to the perfectes Conclusion that the nucleus of an atom is heavy, dense and tiny space at the ntre of the atom? A, most alpha particles mere elected back to the Soure​