Question

The electronic configuration of an element is $1s^2,2s^2,2p^6,3s^2,3p^3$. Which is the atomic number of the element which is just below the above element in the periodic table?

• A. 34
• B. 49
• C. 33
• D. 31

Answer 1

Answer: (C)

33

The atomic number of the above element is $2+2+6+2+3=15$. The atomic number of the element below the given element is $15+18=33$.