write electro dot structure of calciumnitride?
Answers
Answer:
The correct answer is
C
a
3
N
2
.
Let us see how we got the answer; Look at the electronic arrangement of Ca and N atom.
Ca ( Z= 20) has 20 electrons with following electronic configuration. 1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
4
s
2
.
It loses two electron in its 4s subshell to achieve stability and forms ion
C
a
2
+
.
C
a
2
+
= 1
s
2
2
s
2
2
p
6
3
s
2
3
p
6
N ( Z=7) on the other hand has seven electrons and wants to gain three electrons to achieve stable noble gas configuration.Nitrogen atom on gaining three electrons forms negative nitride ion,
N
3
−
ion.
N ( Z=7) = 1
s
2
2
s
2
2
p
3
N
−
3
= 1
s
2
2
s
2
2
p
6
Two Nitrogen atoms gains three electrons each ( total of six) from three Ca atoms, each Ca atom loses two electrons (total of six) to two Nitrogen atom , in this process each Ca atom becomes
C
a
2
+
ion and nitrogen atom after gaining three electrons becomes
N
3
−
ion.
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