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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Which of the following statement is wrong:
  • A
    An atom is electrically neutral.
  • B
    The size of a cation is smaller than that of the corresponding atom.
  • C
    The size of an anion is bigger than that of the corresponding atom.
  • D
    An atom and its ion have an unequal number of protons.
✓

Answer

  1. An atom and its ion have an unequal number of protons.

Explanation:

An atom and its ion have an equal number of protons.

Thus, for example, a chlorine atom and chloride ions have an equal number of protons. 

When the chlorine atom is converted into a chloride ion, there is no change in the composition of the nucleus. 

A chlorine atom has one electron less than a chloride ion.

Chlorine atom gains one electron to form chloride ion.

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