the following data represents the distribution of electrons ,protons and neutrons in atoms of four elements A, B, C, D.


A 19 21 19

B 17 18 17

C 17 20 17

D 18 22 18

Answer the following:

1. describe the electronic distribution in atom of element B.

2. is element B a metal or non-metal? why?

  • Electronic distribution of B= 2,8,8,1
  • Element B is a metal because it has only one electron in valence shell and  it will easily release this electron to get a stable nobel gas configuration.

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