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Effective nuclear charge
➡⬆
Atomic radius
⬅⬇
Ionization energy
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Electron affinity
➡
Metallic character
⬅⬇
Alkali metals
1, compounds naturally, soft, oxides, peroxides, superoxides
Alkaline earth metals
2, Be doesn’t react with water, Mg only with steam, reactivity ⬇
Chalcogens
6, metallic character ⬇, some are metals, some nonmetals, some metalloids
Halogens
7, anions in nature, form metal halides
Noble Gases
8, large IE, positive EA, relatively unreactive, monoatomic gases
