Why do elements that are in the same group of the periodic table share similar properties?(1 point)

Responses

They are all metals.
They are all metals.

They all have the same atomic mass.
They all have the same atomic mass.

They all have the same number of electrons in the outer shell.
They all have the same number of electrons in the outer shell.

They are all very reactive with other elements.

1 answer

They all have the same number of electrons in the outer shell.