The formation of CsCl from Cs(s) and Cl2(g) involves the following steps:
1. Cs(s) →Cs(g)
2. 1/2Cl2(g) → Cl(g)
3. Cs(g) → Cs^+(g) + e^-
4. Cl(g) + e^- → Cl^-(g)
5. Cs^+(g) + Cl^-(g) → CsCl(s)
Which of these steps absorb energy and which release energy?
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