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              首頁 > 元素周期表

              元素周期表

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              硼 B
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              碳 C
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              氮 N
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              氧 O
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              氟 F
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              氖 Ne
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              鈉 Na
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              鎂 Mg
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              鋁 Al
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              釩 V
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              鐵 Fe
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              鎵 Ga
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              鍺 Ge
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              砷 As
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              硒 Se
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              溴 Br
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              氪 Kr
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              銣 Rb
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              釔 Y
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              金 Au
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              鉈 Tl
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              鉛 Pb
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              鉍 Bi
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              釙 Po
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              砹 At
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              氡 Rn
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              鈁 Fr
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              鐳 Ra
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              Uub
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              Uut
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              Uuq
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              Uuh
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              Uus
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              *鑭系元素
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              鐠 Pr

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              釹 Nd

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              釤 Sm
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              銪 Eu
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              釓 Gd
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              鋱 Tb
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              鏑 Dy
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              鈥 Ho
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              鉺 Er
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              銩 Tm
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              鐿 Yb
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              镥 Lu
              **錒系元素
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              錒 Ac
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              釷 Th
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              鏷 Pa
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              鈾 U
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              镎 Np
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              钚 Pu
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              镅 Am
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              鋦 Cm
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              锫 Bk
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              锏 Cf
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              锿 Es
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              鐨 Fm
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              鍆 Md
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              锘 No
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              鐒 Lr

              關于元素周期表

              元素周期表是1869年俄國科學家門捷列夫(Dmitri Mendeleev)首創的,后來又經過多名科學家多年的修訂才形成當代的周期表。

              元素周期表中共有118種元素。每一種元素都有一個編號,大小恰好等于該元素原子的核內電子數目,這個編號稱為原子序數。

              原子的核外電子排布和性質有明顯的規律性,科學家們是按原子序數遞增排列,將電子層數相同的元素放在同一行,將最外層電子數相同的元素放在同一列。

              元素周期表有7個周期,16個族。每一個橫行叫作一個周期,每一個縱行叫作一個族。這7個周期又可分成短周期(1、2、3)、長周期(4、5、6)和不完全周期(7)。共有16個族,又分為7個主族(ⅠA-ⅦA),7個副族(ⅠB-ⅦB),一個第ⅧB族,一個零族。

              元素在周期表中的位置不僅反映了元素的原子結構,也顯示了元素性質的遞變規律和元素之間的內在聯系。

              同一周期內,從左到右,元素核外電子層數相同,最外層電子數依次遞增,原子半徑遞減(零族元素除外)。失電子能力逐漸減弱,獲電子能力逐漸增強,金屬性逐漸減弱,非金屬性逐漸增強。元素的最高正氧化數從左到右遞增(沒有正價的除外),最低負氧化數從左到右遞增(第一周期除外,第二周期的O、F元素除外)。

              同一族中,由上而下,最外層電子數相同,核外電子層數逐漸增多,原子序數遞增,元素金屬性遞增,非金屬性遞減。

              元素周期表的意義重大,科學家正是用此來尋找新型元素及化合物。

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