What is the atomicity of Phosphorus?

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RRB ALP CBT I 17 Aug 2018 Shift 3 Official Paper
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  1. Tetra-atomic
  2. Mono-atomic
  3. Poly-atomic
  4. Di-atomic

Answer (Detailed Solution Below)

Option 1 : Tetra-atomic
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Detailed Solution

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The correct answer is Tetra-atomic.

Key Points

  • Phosphorus is represented by P4.
  • The number of atoms present in a phosphorus molecule is 4.
  • Therefore, the atomic number of phosphorus is 4 because it is atom four.

Important Points

  • The number of atoms that make up a molecule is called its atomic number.
  • Atomicity is monatomic if there is only one atom, diatomic if there are two atoms, triatomic if there are three atoms, and so on.
  • If there are more than four atoms, atomicity is polyatomic.

Additional Information

  • Mono-atomic:
    • Monoatomic or monad elements are elements that are stable as single atoms.
    • Mon- or Mono- means one. For an element to stabilize itself, it must have a stable set of eight valence electrons.
  • Poly-atomic:
    • if an ion consists of two or more atoms, it can be called a polyatomic ion or molecular ion.
  • Di-atomic:
    • A molecule of a detail that has atomicity 2 or has 2 atoms in its molecule, is referred to as a diatomic.
    • example:- hydrogen, oxygen, and nitrogen are diatomic.

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