Just need help on these questions :) 1. _ is a positive ion and ___ is a negative ion.
2. Two or more substances mixed but not chemically combined are a _.
3. Acids solutions have pH values below ___.
4. A solution with a pH of 0 is very ___.
5. A solution with a pH of 7 is ___.
6. Pure water has a pH of __.
7. Basic solutions have pH values above__.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

answersilicon (si); oxygen (o);