KOH IS and acid or a base?

quartz

explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a