Element A is a soft metal. It is a silvery solid at room conditions and can react with water to give off hydrogen and form an alkaline solution.
It is a alkali metal.
Can the element be an alkaline earth metal? Explain?
2007-07-02 16:43:31 · 2 個解答 · 發問者 carolene 1 in 科學 ➔ 化學
to小孩子
但sodium是soft metal 喎........
2007-07-03 14:18:07 · update #1
to小孩子
但calcium是soft metal 喎........
2007-07-03 14:18:51 · update #2
No, it must NOT be an alkaline earth metal.
Although some alkaline earth metals (such as Ca, Sr, Ba) can react with water to give hydrogen gas, all alkaline earth metals are not soft metals. This is because the metallic bonds in alkaline earth metals are much stronger than those of alkali metals.
Since element A is a soft metal, the element must NOT be an alkaline earth metal.
2007-07-02 17:38:22 · answer #1 · answered by 老爺子 7 · 0⤊ 0⤋
Yes.
It can be calcium which is an alkaline earth metal. Calcium is also a soft silvery solid at room conditions. See
http://en.wikipedia.org/wiki/Calcium
It can react with water to give off hydrogen and form an alkaline solution calcium hydroxide.
Ca + 2H2O ---> Ca( OH )2 + H2
Hope it helps.
2007-07-02 16:50:09 · answer #2 · answered by Gabriella Montez 7 · 0⤊ 0⤋