What do all group 2 elements have in common? (2 points) they all gain two electrons to form a stable outer energy level. they form convalent bonds with halogens. they all react easily with the noble gases. they tend to form ionic bonds by losing electrons

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.

the answers would be

the first one and the second one