The ph scale is used to express the concentrations of hydronium ions and ions in solutions.

a.) carbon
b.) potassium
c.) hydroxide

b is the correct answer

mark me brainliest and hope this

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

c) should be the answer.