Characteristics of Protons


 
 
Concept Explanation
 

Characteristics of Protons

Characteristics of Protons:

  • A proton is a positively charged particle present in the atoms of all elements.
  • The mass of a proton is 1838 times that of an electron. The relative mass of a proton is equal to 1.005757 amu which is taken to be equal to 1 amu. The absolute mass of a proton is 1.672 times 10^{-27}g.
  • The charge on a proton is equal in magnitude but opposite in sign to that of an electron. The charge carried by a proton is equal to large 1.602 ;X;10^{-19} C which is taken to be one unit of positive charge (i.e., +1). Thus, a proton is said to carry a unit positive charge.
  • Conclusion: The mass of a proton is taken as one unit and its change is (+ 1), whereas the mass of an electron is considered to be negligible and its charge is (-1). It seems that an atom is composed of protons and electrons, mutually balancing their charges.

    Sample Questions
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    Question : 1

    Which of the following sub-atomic particles has/have 1u relative mass and +1 relative charge?

    • (i) Proton
    • (ii) Electron
    • (iii) Neutron
    Right Option : B
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    Explanation
    Question : 2

    The absolute mass of a proton is _____________g.

    Right Option : B
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    Explanation
    Question : 3

    Which of the following statement / statements are correct :

    (a) Proton is a positively charged particle.

    (b) Mass of proton is 1.67 X 10-27 kg.

    (c) The charge on a proton is equal in magnitude but opposite in sign to that of an electron.

    Right Option : D
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    Explanation
     
     


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