Which state of matter has a definite volume but an indefinite shape?

this is a liquid! remember solids are definite shapes and volumes.  liquids definite volume (as the amount does not change) but indefinite shape (as it conforms to the container) and gas has indefinite shape and indefinite volume :)

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.

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.