Question

现有A、B、C、D四种短周期元素,它们的原子序数依次增大,D元素原子最外层电子数是次外层电子数的三倍。A、B

素原子的最外层电子数之和与C元素原子的最外层电子数相等，A能分别与B、C、D形成电子总数相等的分子，且A与D形成的化合物在常温条件下为液态。(1)A与C两种元素可形成多种化合物分子，其中CA3的化学式为__;C2A4的电子式为__(2)B与D可形成2种常见化合物，其中一种化合物BD2与A2D反应的化学方程式为__.

Answer 1

A:H B:C C:N D:O
CA3的化学式为:NH3.B2A4的电子式为:CH2=CH2.电子式写不了.
化合物BD2与A2D反应的化学方程式为:CO2+H2O===H2CO3

Answer 2

D元素原子最外层电子数是次外层电子数的三倍,因此D原子序数为2+6=8，即氧。A元素为氢，C元素为碳，B为铍。剩下的打字都不好打啊。。。

Answer 3

Hypotensive effect of verapamil Study

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Answer 4

一般都不是很了解 你应该上网查查