鈉（粵拼：naap6）係一隻金屬元素，原子序數係11，原子重量22.98976928(2)。佢個符號係Na，來自拉丁文Natrium。鈉好軟，帶蠟質，銀白色。佢屬於鹼金屬，化學性質好活躍，遇空氣會氧化，遇水會有激烈反應，好容易同其他元素化合，大自然多數溶響海水。金屬燒起上來係黃色。
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