What determines if an ion is negative or positive?

the number of electrons in it's outermost energy level

Explanation:

if the number of electrons in its outermost energy level is less than 4 that's the ion reacts by losing electrons and is thus the ion is positively charged

is the number of electrons in the outermost energy level is more than 48 react by gaining electrons and thus it is negatively charged

Ions are atoms with extra electrons or missing electrons. When you are missing an electron or two, you have a positive charge. When you have an extra electron or two, you have a negative charge.

Explanation:

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.