【单选题】【消耗次数:1】
某元素原子的最外层电子数与次外层电子数相同,且最外层电子数与次外层电子数之和小于8,它是
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【单选题】 某元素原子核外有3个电子层,最外层上有1个电子,该元素的核电荷数 为
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③  1
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【单选题】 某元素的原子核外有3个电子层,最外层有4个电子,该原子核内的质子数为( )。
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【单选题】 某短周期元素的最高正价与最低负价的代数和为4,则该元素原子的最外层电子数为( )。
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【单选题】 决定多电子原子的电子运动能量的量子数是
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【单选题】 原子核外的M电子层和L电子层最多容纳的电子数的关系是 ( )。
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①  n=1,l=0,m=0,ms =+1/2
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【单选题】 It’s no good ____ him. He is always indifferent towards others’ matters.
①  to turn to
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【单选题】 In order to prepare a lecture, one must do a lot of research and spend plenty of time____ his material so that his speech is clear and easy to follow.
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①  that
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①  as it is
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