Question

what are the groups and periods in Modern Periodic Table​

Answer 1

Answer:

groups are. vertical column(down the table)

Answer 2

Answer:

1. Groups and periods are two ways of categorizing elements in the periodic table.
2. Periods are horizontal rows (across) the periodic table
3. while groups are vertical columns (down) the table.
4. Atomic number increases as you move down a group or across a period