10. Periodic Properties of the Elements
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So here it says, elements with blank first ionization energies and more blank electron affinities generally form cations. So remember, a cation is a positive ion. And if you're trying to make a positive ion, that means that you're a metal. Remember metals tend to form cations. Now that we know that it's a metal, let's think about electron affinity and ionization energy for metals. Metals tend to have low, metals. Metals tend to have low, first ionization energies. It it's easy to remove their electrons so they can become a positive ion. So here that would mean that the answer is either a or c. And let's think about electron affinity. Remember, as we head towards the top right corner away from the metals, our electron affinity will increase. It becomes more exothermic. So here we're doing the exact opposite. Opposite. Metals are more to the left, so they're not more exothermic, they're more endothermic. So here we're going to have c as our best answer.
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