transition metals 既問題..................

Transition metals are less reactive than metals in Group I in Group II. This is because the electrons in the outermost shell of transition metals are held more strongly by the nuclei.

The reasons for strong attractions between the electrons in the outermost shell and the nuclei of transition metals:
(1) In the same period, the transition metals have stronger nuclear charges (i.e. more numbers of protons in the nuclei) than the metals in Group I and Group II.
(2) In the same period, the transition metals have smaller sizes than the metals in Group I and Group II.
(3) The transition metals have more inner d electrons to screen the nuclear attraction of the electrons in the outermost shell. However, the screening effect of d electrons is low. (If you have not learned AL inorganic chemistry, forget point (3)).
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你要睇翻個電化序,最上既react firstly

通常最外層電子越少,react 是最強..因為果d電子(越少),電子同質子吸引力越少。電子易失去

react完會變ion(lose electron)