当含Li+、Na+、K+的溶液进行离子交换时,各离子在交换柱中从上到下的位置为()
K、Na、Mg、Ca、Li、AlH3、MgO、电石中,遇水发生激烈反应的有()。
元素周期表第一族阳离子H+有酸味,Li+有甜味,Na+有()。
3. 下列元素中第一电离能最小的是(A) Li (B) Be (C) Na (D) Mg
Ho Feng-Shan was a Chinese ____________. When he was Consul-general in Vienna, Austria during World War II.
In the class about libido,Freud talked _____tiers in people’s mind.
2. She thought Iwas talking about her daughter, _________, in fact, I was talking about mydaughter.
You can talk with food in your mouth.
What are the main points in the talk?
In Li Jiang City, of old houses helped prevent the structure from breaking up in the earthquake in 1996.
1.What does the sentence “Talking helps.” in paragraph mean?
Talking fast in a job interview shows your confidence.
What's being discussed in the talk?
元素周期表第一族阳离子H+有酸味,Li+有甜味,Na+有()。
Translating Jiang Shan talked LI NA into returning to the sport two years after Li had dropped out to study at a university.
The author's tone in talking about fire ants in the US seems to be
Which is not talked about in this passage?
由于E(Li+/Li)=-3.04V,E(Na+/Na)=-2.71V,可见在水溶液中金属锂比金属钠活泼,锂与水的反应也比钠与水的反应
下列离子使带负电荷的胶体聚沉,其聚沉能力顺序正确的是()A.Cs+>Rb+>K+>Na+>Li+B
下列水合离子生成时,放出热量最少的是 ()A.Li+B.Na+C.K+D.Mg2+
下列各组元素中,按元素的最高正化合价递增顺序排列的是 A、C、N、O、F B、Li、Na、K、Rb C、P、S、Cl、Ar D、Na、Mg、Al、Si
碱金属Li、Na、K、Rb、Cs与空气中氧气反应的剧烈程度依次 ;与水反应的剧烈程度依次 ;说明它们的活泼性依次 。 ()
一定温度和浓度的水溶液中,Li+、Na+、K+、Rb+的摩尔电导率依次增大的原因是:
正确于相似元素Li+、Na+、K+的分离常用()法