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The α -particle scattering experiment of Rutherford concluded that:
(1) The nucleus is made up of protons and neutrons
(2) The number of electrons is exactly equal to number of protons in atom
(3) The positive charge of the atom is concentrated in a very small space
(4)Electrons occupy discrete energy levels
Ans: The positive charge of the atom is concentrated in a very small space
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For the n= 2 energy level, how many orbitals of all kinds are possible: (1) 2 (2) 3 (3) 4 (4) 5 Ans: 4
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The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is: (1) 7 (2) 6 (3) 5 (4) 3 Ans: 7
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