Question

The long form of the periodic table consists of:

• A. seven periods and eight groups
• B. seven periods and eighteen groups
• C. eight periods and eighteen groups
• D. eighteen periods and eight groups

Hint:

Modern periodic table:

Periods = 7 (horizontal)
Groups = 18 (vertical)

Answer 1

The Correct Option is B

Step 1: Recall the structure of the modern (long form) periodic table. The modern periodic table is arranged based on increasing atomic number. Step 2: Identify the number of periods. There are 7 horizontal rows called periods. Step 3: Identify the number of groups. There are 18 vertical columns called groups. Step 4: Match with the options. The correct description is: \[ \text{seven periods and eighteen groups} \] Final Answer: \[ \boxed{\text{(B)}} \]