Periodic Table Structure

The modern periodic table, based on the modern periodic law, is structured as follows:
1. Elements are arranged in order of increasing atomic number
2. There are 7 periods (horizontal rows) and 18 groups (vertical columns)
3. Elements in the same group have similar chemical properties due to similar outer electron configurations
4. The table is divided into s-block, p-block, d-block, and f-block elements based on their electron configurations
5. It includes lanthanides and actinides as separate series at the bottom of the table