f.3 chemistry=口=The chemical formula of the chloride of M is

M is an element in the third period of the periodic table. M forms a sulphate which has the chemical formuls M2SO4. The chemical formula of the chloride of M is
A. MCl
B. MCl2
C. M2Cl
D. M2Cl3

miss左個2

2個M match 1個 SO42-
M=groupI

cation of M = 1+
Cl anion = 1-

A

[[i] 本帖最後由 昌昌 於 2009-3-8 01:58 編輯 [/i]]

[quote]原帖由 [i]昌昌[/i] 於 2009-2-25 20:09 發表 [url=http://www3.3boys2girls.com/redirect.php?goto=findpost&pid=33673282&ptid=555927][img]http://www3.3boys2girls.com/images/common/back.gif[/img][/url]
M=groupII

cation of M = 2+
Cl anion = 1-

B [/quote]

訓喇7頭

答案A呀

答案係A

因為 SO4 嘅離子係2-
個chemical formula係M2SO4
證明 M 嘅離子係1+
而 Cl 嘅離子係1-
所以 答案係MCl 而唔係其他..
清楚?

A.

Because the chemical formula of M sulphate is M2So4

The charge of So4 is 2 -

So that it needs to lose 2 electron

There are 2 element M,

We can know as M is a Group I element, the charge is 1+

The charge of Chlorine ion is 1 -

So that the Answer is MCl.