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Question

The atomic number of some elements is given as 10,20,7,and14. Identify the elements.


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Solution

Atomic number:

  1. Atomic number is equivalent to the number of protons present in the nucleus of each atom of that element that is also equal to number of electrons.
  2. The chemical elements can be uniquely identified by their atomic number.
  3. The atomic number and the number of electrons are both equal in a regular, uncharged atom.

Neon:

  1. The element having an atomic number 10 will have 10 electrons present in it.
  2. Neon is the element with an atomic number10.
  3. It is a colorless, odorless noble gas.

Calcium:

  1. The element having an atomic number 20 will have 20 electrons present in it.
  2. Calcium is the element having an atomic number20.
  3. It is an alkaline earth metal that is reactive when exposed to air.

Nitrogen:

  1. The element having an atomic number 7 will have 7 electrons present in it.
  2. Nitrogen is the element having an atomic number 7
  3. It is a non-metal and lightest member in group15.

Silicon:

  1. The element having an atomic number 14 will have 14 electrons present in it.
  2. Silicon is the element having an atomic number 14
  3. It is a crystalline hard metalloid and semiconductor.

Therefore, the elements with 10,20,7,and14 are Neon, Calcium, Nitrogen, and Silicon.


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