Question

if the second energy level of an atom has one electron, how many more electrons does it need in order for that energy level to be filled to its maximum capacity?
answer
five
two
one
seven
i dont know yet

Explanation:

Step1: Recall electron - capacity rule

The maximum number of electrons in the $n$th energy level is given by $2n^{2}$. For the second energy level ($n = 2$), the maximum number of electrons is $2\times2^{2}=8$.

Step2: Calculate remaining electrons

There is 1 electron already. So the number of electrons needed is $8 - 1=7$.

Answer:

D. Seven