Discovery of Subatomic Particles

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Subatomic Particles - Electron

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Subatomic Particles - Protons

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Subatomic Particles - Neutrons

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Atomic Theory of Matter

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Important Questions

Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

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What are canal rays?

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(i) Calculate the number of electrons which will together weighs one gram. 
(ii) Calculate the mass and charge of one mole of electrons.

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Which of the following statements is not correct about the characteristics of cathode rays?

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The increasing order for the values of (charge/mass) for electron (), proton (), neutron () and alpha particle () is:

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Fill in the blanks in the following statements:
(a) The number of protons in the nucleus of an atom is called its ______.
(b) The total number of protons and neutrons in the nucleus of an atom is called ______.
(c) An atom has atomic mass number 23 and atomic number 11. The atom has ______ electrons.
(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ___________.
(e) If the nucleus of an atom has atomic number 17 , mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ______.
(f) Almost all the mass of an atom is concentrated in a small region of space called the ______.
(g) Cathode rays are a beam of fast moving ______.
(h) The anode rays obtained from hydrogen gas consist of particles called ______.
(i) The maximum number of electrons that can be accommodated in L shell are ______.
(j) The maximum number of electrons that can go into the M shell is ______.
(k) The subatomic particle not present in a hydrogen atom is ______.
(l) The electron has ______ charge, the proton has ______ charge, and the neutron has ______ charge.

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On the basis of Thomson's model of an atom, explain how the atom is neutral as a whole?

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Which of the following is not a postulate of Dalton's atomic theory?

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Which of the following statements about the electron is incorrect? 

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State the various postulates of Dalton's atomic theory of matter.

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