1) An ? is the smallest particle of an element which retains its chemical identity in all the physical and chemical changes. a) molecule b) proton c) atom d) electron 2) The plum pudding model of atom put forth by whom in the year 1904? a) J J Thomson b) Rutherford c) Dalton 3) Negatively charged particles called ---------- revolve around the nucleus. a) protons b) nucleons c) electrons 4) Energy of an electron is -------- while it is in a particular orbit. a) constant b) exponential c) increases d) decreases 5) Almost entire mass of the atom is concentrated in the ------. a) proton b) nucleus c) electrons 6) The energy of an electron is determined by the ---- in which it is present. a) shell b) nucleus c) orbit 7) Atomic number of carbon is 6. How many electrons are there in a carbon atom ? a) 3 b) 9 c) 6 d) 12 8) A symbol ‘-’ is used for the ordinal number of a shell. a) o b) k c) e d) n 9) 42H (Helium) indicates that the atomic mass number of helium is ? a) 8 b) 4 c) 2 d) 3

Inside the atom

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