In the modern periodic table there are:
7 horizontal rows called periods, and
18 vertical columns called groups numbered from 1-18.
Final Answer:
So, horizontal rows and vertical columns in a periodic table are periods and groups respectively.
In the modern periodic table there are:
7 horizontal rows called periods, and
18 vertical columns called groups numbered from 1-18.
Final Answer:
So, horizontal rows and vertical columns in a periodic table are periods and groups respectively.