Which statement(s) about electrons is/are TRUE? SELECT ALL THAT APPLY
a
When they were first discovered, they were named
"corpuscles."
b They have a negative charge.
с
They have a unique charge-to-mass ratio
depending on the element.
d They have a tiny but significant mass.

a graduated cylinder.

explanation:

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l