Which of the following statements are true? Which of the following statements are true? 1. The energy change for this process is the electron affinity of the Ca+ ion. 2. The energy change for this process is the negative of the first ionization energy of the Ca atom. 3. The energy change for this process is the negative of the electron affinity of the Ca atom.

Statement 1 and 3 are true

Explanation:

Ca+(g) + e- ➡Ca(g)

Electron affinity of an atom or molecule is defined as the change in energy (in kJ/mole) of a neutral molecule(in gaseous state)when an electron is added to an atom to form a negative ion.Energy is released in the process thus the first electron affinities are negative.

On the other hand ionisation energy is the quantity of an energy a gaseous atom in its ground must absorb to discharge an electron.

H(g)➡H+(g) + e-

Considering both these definitions,statement 1 and 3 both falls true.

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