有X、Y两种元素，原子序数均不超过20，X的原子半径小于Y，且X、Y原子的最外层电子数相同（选项中m、n均为正整数）。下列说法正确的是
| A．若Y(OH)n为强碱，则X(OH)n也一定为强碱 |
| B．若HnXOm为强酸，则HnYOm也一定为强酸 |
| C．若X元素的单质是非金属，则Y元素的单质也一定是非金属 |
| D．若Y的最低负价为－n，则X的最低负价也一定为－n |
相关试题
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| A．continued | B．immediate | C．careful | D．general |
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| A．as | B．if | C．though | D．unless |
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Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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