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NDA 2 2024 GAT, question 118

Topic: Chemistry

Q118

For Aluminium (AlAl) (atomic number : 1313, mass number : 2727), which one among the following statements is NOT correct ?

  1. (a) Number of electrons present in AlAl is 1313
  2. (b) Number of protons present in AlAl is 1313
  3. (c) Number of neutrons present in AlAl is 1414
  4. (d) The valency of AlAl is 22Correct answer

Solution.

Answer: (d) The valency of AlAl is 22

  1. For aluminium with atomic number 13 and mass number 27, there are 13 protons, 13 electrons in the neutral atom, and 14 neutrons.
  2. Its usual valency is 3, not 2, so that statement is incorrect.