某元素的原子核外有3个电子层，最外层电子数为6，该元素在周期表中的位置是？
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Correct answer
A. 第三周期第ⅥA族
Principle or equation
电子层数=周期数，最外层电子数=主族序数。
Why this answer is correct
3个电子层对应第三周期，最外层6个电子对应第ⅥA族。
Example
硫（S）原子序数16，电子排布2,8,6，位于第三周期第ⅥA族。
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