Answers

2014-12-01T19:22:31+05:30
The rows of the table are called periods and the columns are calledĀ groups.there are 18 columns and 7 rows.
0
2014-12-01T19:47:45+05:30
In periodic table 18 vertical columns are there.vertical columns are known as groups and 7 horizontal rows known as periods.
0
vertical columns are called groups whereas horizontal rows are periods.