Elements in the modern periodic table are arranged in ___________ vertical columns.

Correct option is A

The correct answer is A) 18.

Explanation:

• Elements in the modern periodic table are arranged in 18 vertical columns, also known as groups.

Information Booster:

• Modern Periodic Table:
  • Groups: 18 vertical columns.
  • Periods: 7 horizontal rows.
  • Arrangement: Based on increasing atomic number.
• Periodic Law: Elements with similar properties are placed in the same group.