Answer:
Name the element: Beryllium
Number of shells: 4
Valence electrons: 2
Explanation:
William Penn
0.001 M OH-
[OH-] = 10^-pOH, so
pOH + pH = 14 and 14 - pH = pOH
14 - 11 = 3
[OH⁻] = 10⁻³ ; [OH-] = 0.001 M OH-