Lesson 10 of 22
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Chapter 2 summary and exercises


Three important nutrients for the growth of plants are nitrogen, phosphorus, and potassium.

  1. Write the electron configuration of nitrogen, phosphorus, and potassium.
  2. Specify the valence electrons of each of the above elements.
  3. Specify the number of the valence energy level of each of the given elements.
  4. Deduce the period, group, and column of each of the given elements in the periodic table.
  5. Identigy the families to which nitrogen, phosphorus, and potassium belong.

Exercise 2:

The electron configuration of ion X3+ is K2 L8

  1. Find the number of electrons of the ion X3+.
  2. Determine the number of the electrons, the atomic number, and the mass number of the Atom X, knowing that it has 14 neutral subatomic particles.
  3. White the electron configuration of Atom X.
  4. Locate Atom X in the periodic table.
  5. Specify if Atom X follows the duet or the octet rule to reach stability.