Which of the following statements is correct with regard to a complex ion?

A complex ion consists of a central ion bonded to two or more donor ions or molecules, usually does not dissociate into simple ions or molecules even in a solution, and exhibits properties different from its constituent ions or molecules.

The donor ions and molecules which coordinate with the central atom or ion in a complex are called ligands.

The sum of the number of electrons present in the central metal ion or atom and those donated by the ligands is called the effective atomic number of the central metal atom and this number is usually the same as the atomic number of the next higher noble gas.

All of these