Respuesta :

ZJSG09112007

Answer:

  1. Elements of the  the same group have similar number of valence electrons.
  2. They have identical number of electrons in their outermost shell. For example ;  All the alkali metals in Group 1 have 1 valence electron.

And so many more.

Due to all these similarities ,they have similar  properties and they tend to react similarly with other substances.

Explanation:

laratunca2004

Answer:

The number of valence electrons.

Explanation:

Electrons mainly have to do with the reactions and how bonds are formed between elements. Elements are placed in groups based on the number of valence electrons. The number of valence electrons determine the element's properties such as its reactivity with other elements. Therefore, the reason why elements in the same group have similar properties is because each group has the same amount of valence electrons (number of electrons in outermost shell) which affects its properties.

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