2. A description of the formation of a cation from an atom of a metallic element, using the octet rule and the importance of noble-gas electron configurations.

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explanation:

the answer is c.the valence of the atoms combine .

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