elements in a group have similar?

Elements in the same group have similar chemical behaviors.

All the elements in one group have the same number of valence electrons. … Since elements in a group have the same number of valence electrons, they behave similarly in chemistry. An example would be the alkali metals (excepting hydrogen. Hydrogen is in this group only because it has one valence electron.

Why do elements in the same group have similar physical and chemical properties?

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