Question

From the list given below, elements which belongs to the same group or sub-group are :

• A. atomic number $=12,20,4,88$
• B. atomic number $=8,16,34,2$
• C. atomic number $=11,18,27,5$
• D. atomic number $=24,47,42,55$

Answer 1

The correct option is A atomic number $=12,20,4,88$

The elements with atomic numbers 12, 20, 4, 88 belong to the same group 2.
They are Mg, Ca, Be and Ra.
They are alkaline earths and belong to s block of the periodic table.