What do atoms in the same group have in common, and what do atoms in the same period have in common?

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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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givingiswinning | Student

Atoms in the same group share the same amount of valence electrons and reactivity.

Atoms in the same period, share energy levels.

 
 
atyourservice | Student

Atoms in the same group share the same amount of valence electrons and reactivity.

Atoms in the same period, share the same principal energy level

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