What do atoms in the same group have in common, and what do atoms in the same period have in common?
Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells. As a result, they will all have the same chemical reactivity. For...
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Atoms in the same group share the same amount of valence electrons and reactivity.
Atoms in the same period, share energy levels.