chapter 4
الخطوط العريضة للقسم
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I. Periodicity
I.1. groups
I.2. periods
II. Periodic properties
II.1. atomic radius
II.2. ionization energy
II.3. electronegativity
I. Periodicity
I.1. groups
I.2. periods
II. Periodic properties
II.1. atomic radius
II.2. ionization energy
II.3. electronegativity