Which of the following statements are true?
a. the energy change for this process is the electron affinity of the ca+ ion.
b. the energy change for this process is the negative of the first ionization energy of the ca atom.
c. the energy change for this process is the negative of the electron affinity of the ca atom.

c.The energy change for this process is the negative of the electron affinity of the Ca atom

Explanation:

This is the case as electron affinity denotes the energy released or absorbed when an atom gains an electron.

The energy change for this process is the negative of the first ionization energy of the Ca atom. TRUE

The energy change for this process is the electron affinity of the Ca+ ion. TRUE

the other one is false

Explanation:

1.solid

2.carbon dioxide

3.helium