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Atoms of elements in the same group have the same number of [Blank] This is why they have similar chemical properties.
A.Protons
B.neutrons
C.Valence electrons

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dcdragon
Atoms of elements in the same group have the same number of Valence Electrons.

The atoms of elements in the same group have the same number of valence electrons.

In the modern periodic table :  

  • Elements are placed according to their atomic numbers
  • There are 7 periods (horizontal rows)
  • There are 18 groups (vertical groups).
  • Elements in the same period have the same valence shell
  • Elements in the same group have the same number of valence electrons.
  • Elements in the same group have similar chemical properties.

So, from this, we can conclude that atoms of elements in the same group have the same number of valence electrons.

Learn more about the periodic table:

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