Except for elements with atomic number 1 and 2, all other elements are stable with how many electrons in their outermost energy level

Except for element   with element with atomic number 1 and 2 all  other elements are stable with  8 electron in their outermost energy level.

explanation

stable element has eight electron in their outermost  energy level. for example neon which has    2.8 electronic configuration is stable since has eight(8) electrons in its outermost energy level.

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.