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            首頁 > 元素周期表

            元素周期表

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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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