Which of these solutions is most basic? A
[OH-] = 1 x 10-4 M

B
[H+] = 1.2 x 10-11 M

C
​[OH-] = 1 x 10-13 M

D
[H+] = 1 x 10-2 M

E
[H+] = 1.9 x 10-10 M

yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes

explanation:

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