The third energy level will hold 18 electrons. Hence, option (D) is correct.
The electrons surrounding an atom are located in regions around the nucleus called “energy levels”.
An energy level represents the 3-dimensional space surrounding the nucleus where electrons are most likely to be.
The general formula is that the nth shell can hold up to 2(n²) electrons in principle.
Therefore, The third energy level will hold 18 electrons. Hence, option (D) is correct.
Learn more about Energy level here ;
https://brainly.com/question/17396431
#SPJ2