元素週期表 區
區（英文：Block），或者叫元素分區，係元素週期表入面嘅分區，跟元素外層價電子嘅電子排佈去分。已發現元素入面，可以分做四區：s區元素、p區元素、d區元素、f區元素，而未發現嘅第121-138號元素就係g區元素。
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