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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds1 Mark
MCQ
Carbon -12 atom has:
  • A
    6 electrons, 6 protons, and 6 neutrons.
  • B
    6 electrons, 12 protons, and 6 neutrons.
  • C
    12 electrons, 6 protons, and 6 neutrons.
  • D
    18 electrons, 6 protons, and 6 neutrons.
✓

Answer

  1. 6 electrons, 6 protons, and 6 neutrons.
    Explanation:
    The mass number of carbon−12 is 12 and the atomic number of carbon is 6.
    Therefore, the number of protons is 6 and electrons are 6 as the number of protons and electrons are the same in the neutral atom.
    The number of neutrons is equal to the difference of a mass number and atomic number, i.e., 12 - 6 = 6.
    So carbon-12 atom has 6 electrons, 6 protons, 6 neutrons.

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