Question

Among the given option which one has an ascending order of increasing atomic size.

• A. Na < Al < Mg < S < Cl
• B. Cl < S < Mg < Al < Na
• C. Na < Mg < Al < S < Cl
• D. Cl < S < Al < Mg < Na

Answer 1

The correct option is D

Cl < S < Al < Mg < Na

When we move from left to right in a period the size of the atom of the element decreases due to increasing nuclear charge. So the correct order for the atomic size in the given option would be Cl < S < Al < Mg < Na.

Note: The order of increasing size is the reverse of how these elements are arranged in the same period.