元素の原子の電子配置は2,8,8,2です。（a）その原子の原子番号は何ですか？
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The electronic configuration of an element 'X' is 2, 8, 8, 2. To which (a) period and (b)g
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原子質量39の元素は電子配置2,8,8,1を持つ。
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The electron distribution in an aluminium atom is (a) 2,8,3 (b) 2,8,2 (c) 8,2,3 (d) 2, 3,8
The electron distribution in an aluminium atom is(a) 2, 8, 3(b) 2, 8, 2(c) 8, 2, 3 (d) 2, 3, 8
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