What are the quantum numbers of the fifth electron of Na

The last electron is in third shell, so Principal quantum number will be 3 .

The azimuthal quantum no. Can be 0,1,2, but as it is the first electron in last shell so the second quantum no. Will be 0 .

Since the second quantum no. is 0, so the magnetic quantum no. will also be 0.

The spin quantum no. will be +1/2, by hund's rule.

more info ? ? i don't understand what the question is

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.