Question

The number of elements present in the second period of modern periodic table is

• A. 2
• B. 8
• C. 18
• D. 36

Hint:

The second and third periods each contain 8 elements in the modern periodic table.

Answer 1

The Correct Option is B

Concept:
A period in the periodic table is a horizontal row of elements. The second period starts from Lithium \((Li)\) and ends at Neon \((Ne)\). The elements present in the second period are: \[ Li,\ Be,\ B,\ C,\ N,\ O,\ F,\ Ne \]

Step 1: Counting the elements in the second period.
The elements are: \[ \begin{aligned} 1.&\ Li 2.&\ Be 3.&\ B 4.&\ C 5.&\ N 6.&\ O 7.&\ F 8.&\ Ne \end{aligned} \] Thus, the total number of elements is: \[ 8 \]

Step 2: Verifying the answer carefully.
Since the second period contains exactly eight elements, the correct answer becomes: \[ \boxed{(2)\ 8} \]