In the modern long-form of periodic table, the horizontal rows and the vertical columns are called as __________ and ___________ respectively.
A. groups, periods
B. periods, groups
C. rows, columns
D. columns, rows
Answer:B
In the modern long-form of periodic table, the horizontal rows and the vertical columns are called as __________ and ___________ respectively.
A. groups, periods B. periods, groups C. rows, columns D. columns, rows