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Question

An element is represented by symbol X1531.

Is the element a metal or a non-metal?


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Solution

  • The atoms are written in this manner XZA where A denotes mass number and Z denotes the atomic number.
  • Here, the atomic number of the atom will be 15.
  • The electronic configuration of an element describes how electrons are distributed in its atomic orbitals.
  • The electrons are filled in the increasing number of shells viz. K,L,M,N,etc.
  • Number of electrons in a shell is given by 2n2 where n is the number of shells.
  • Putting n=1,2,3 and 4, we get the number of electrons 2,8,18,32 that can be filled in each shell respectively.
  • The atomic number of the element is 15.
  • 2 electrons will fill the first shell i.e., the K shell.
  • 8 electrons will fill the second shell i.e., the L shell.
  • 5 electrons will enter the third shell i.e., the M shell.
  • M shell will be its valence shell having 5 electrons.
  • Metals have 1,2, or 3 electrons in their valence shell.
  • Non-metals have 4,5,6,7, or 8 electrons in their valence shell.

Hence, the element is Non-metal.

Phosphorous is the element having the atomic number 15, and it is a non-metal.


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