1. in the periodic table, the vertical columns that extend down the periodic table are called\nperiods\ngroup…
1. in the periodic table, the vertical columns that extend down the periodic table are called\nperiods\ngroups\nclasses
Answer
Brief Explanations:
In the periodic table, vertical columns are called groups. Periods are the horizontal rows. Classes is not the correct term for vertical columns.
Answer:
B. groups