Which two elements would NOT be capable of forming an ionic bond?

Nacl

Explanation:

Phosphorus and chlorine are the two groups of elements that would not be capable of forming an ionic bond. Ionic bonds occurs between a metal and a non-metal to produce an electrovalent compound.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.