Which of the following is NOT correct regarding the periodic table?

PYQ SSC JE (Junior Engineer) 2023

1. A.

   There are 18 periods and 7 groups in the periodic table.

2. B.

   Group 2 elements are called alkaline earth metals.

3. C.

   Noble gases are included in group 18.

4. D.

   There are 7 periods and 18 groups in the periodic table.

Attempted by 9 students.