A compound has the chemical formula of ＸＹ2. Which of the following show the possible group numbers of X and Y?
a) X: I Y:II
b) X:II Y:I
c) X:IV Y:VI
d) X:VI Y:IV
p.s.,,,in XY2,,,the 2 is at the lower right side,,,which is a smaller letter...= ="
Please explain...
F.4 chem,, chemical formula and group numbers.
2008-10-01 6:18 am
回答 (2)
2008-10-01 8:16 pm
✔ 最佳答案
Answer A and B are wrong as metal would not form a compound like XY2.The answer is C and i would like to use carbon dioxide as an example
For C atoms, there are 4 electrons in the outermost shell.
For O atoms, there are 6 electrons in the outermost shell.
Each C atom needs 4 more electrons to become octet.
Each O atom needs 2 more electrons to become octet.
(Octet means the outermost shell is fully-filled by electrons.)
Thus 1 C atoms and 2 O atoms will share the electrons.
Each O atoms share 2 electrons to C atom and share 2 electrons from C atom
Therefore the X is group VI and Y is group VI.
2008-10-01 6:40 am
C
Like CO2 or MgCI2
X is Group IV and then Y is Group VI
X is Group II and then Y is Group VII
Like CO2 or MgCI2
X is Group IV and then Y is Group VI
X is Group II and then Y is Group VII
參考: myself
收錄日期: 2021-04-13 16:07:09
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