Question

An element with atomic number 8 resembles with an element having atomic number: A. 7 B. 16 C. 5 D.6

Answer 1

The correct answer is option (D).16

Explanation :

• Since the electronic configuration of element with atomic no 8 is given as  :

        $1s^2\hspace3 2s^2 \hspace3 2p^4$

• Now the element which resembles this element will have the same no of unpaired electrons as in the element with atomic no 8. .
• Since the total no of unpaired electrons of the element =2
• So, here the element having atomic no 16 has electronic configuration as :

        $1s^2 \hspace3 2s^2 \hspace3 2p^6 \hspace3 3s^2 \hspace3 3p^4$

• So, it has two unpaired electrons .

Hence , the element whose atomic no is 16 resembles the element with atomic no 8 .