9. Which statement is correct?
(A) Atomic radius decreases down group 17.
(B) First ionization energy decreases down group 1.
(C) Atomic radius increases across period 3 from Na to Cl.
(D) First ionization energy decreases across period 3 from Na to Cl.
詳解 (共 1 筆)
未解鎖
（Ａ）錯誤。原子半徑隨週期數增加而增加。...
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