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Question

The atomic numbers of some elements are given as 10,20,7, and14. Determine the valency of these elements.


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Solution

Valency:

  1. Valency is the ability of an element to join with other elements to form a stable configuration.
  2. Knowing an element's electrical configuration is important for calculating its valency because it allows us to compute the valence electrons.
  3. Valency is equal to valence electrons for elements with valence electrons 1,2 and 3
  4. Valency is equivalent to the 8-valence electrons in the case of elements with 4,5,6,7 and 8valence electrons.

Neon:

  1. It is a chemical element with an atomic number 10 and is represented as "Ne"
  2. It is a colorless, odorless inert gas.
  3. Its electronic configuration is 1s22s22p6
  4. Number of the valence electron in neon is 8
  5. Valency=8-80

Calcium:

  1. It is a chemical element with an atomic number20 and is represented as Ca
  2. It is a highly reactive metal.
  3. The electronic configuration is 1s22s22p63s23p64s2
  4. Number of the valence electron in calcium is 2
  5. Valency also equal to 2

Nitrogen:

  1. It is a chemical element with an atomic number 7 and is represented as "N"
  2. It is a non-metal and most abundant element in the universe.
  3. Its electronic configuration is 1s22s22p3
  4. Number of the valence electron in nitrogen=5
  5. Valency=8-53

Silicon:

  1. It is a chemical element with an atomic number 14and is represented as "Si"
  2. It is a solid, crystalline metalloid and semiconductor in nature.
  3. Its electronic configuration is 1s22s22p63s23p2
  4. Valence electron of silicon is 4
  5. Valency=8-44

Therefore, the valency of the elements with atomic numbers 10,20,7, and14 is 0,2,3, and 4


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