Question

A very reactive element was taken to the laboratory to observe its atomic structure, which was found to be 11. It was also observed that the first two orbits had 2 and 8 electrons respectively. What are the number of electrons present in the outermost shell?

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

The correct option is D 1

The atomic number of the element is 11. So, the atom will have 11 electrons. Now, in the innermost orbit, there are two electrons, and the second orbit has 8 electrons. The remaining electron goes into the valence orbit. Hence the number of valence electrons is one.