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₁₉K = [Ar] 4s¹
₃₇Rb = [Kr] 5s¹
₅₅Cs = [Xe] 6s¹
19 K = 2 8 8 1
37 Rb = [Kr] 5s1
55 Cs = [Xe] 6s1
golongan IA namanya alkali