Vertical columns in the periodotic table are known as a: periods b: groups c: families d: both b and c

Both b and c for the vertical clomns

Hello.

The answer is: A:periods

Its not groups because in a froup there could be up to 18 elments but a vertical coulm could not hold 18. And families are the same as a group.

have a nice day

most likely he is cheating on you

la respuesta es si te gusta hacer lo que siempre haces cuando nunca ves a alguien en el espejo porque sabes que no siempre están ahí.