Question

In the modern periodic table, periods and groups are given. Periods and Groups indicate:

• A. rows and Columns
  
• B. columns and Rows
• C. only rows
• D. only columns

Answer 1

The correct option is A rows and Columns

The horizontal rows are called as periods and the vertical columns are called as groups. There are $7$ periods (rows) and $18$ groups (column). Thus the answer is option A.