How many rows and columns are in the modern Periodic Table?
A. 18 columns and 7 rows
B. 12 columns and 9 rows
C. 7 columns and 18 rows
D. 25 columns and 15 rows
A. 18 columns and 7 rows
B. 12 columns and 9 rows
C. 7 columns and 18 rows
D. 25 columns and 15 rows