Subjective Type

How can I write the formula for calcium nitride ?

Solution

Answer
Ca3N2Ca3N2

Explanation :
The correct answer is Ca3N2Ca3N2

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. 1s22s22p63s23p64s21s22s22p63s23p64s2

It loses two electron in its 4s subshell to achieve stability and forms ion Ca2+Ca2+ .

Ca2+=1s22s22p63s23p6Ca2+=1s22s22p63s23p6

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 N3−N3−
N(Z=7)=1s22s22p3N(Z=7)=1s22s22p3
N−3=1s22s22p6N−3=1s22s22p6

In this process each Ca atom becomes Ca2+Ca2+ ion and nitrogen atom after gaining three electrons becomes N3−N3− ion.

So in all we have three Ca2+Ca2+ ions and two nitride N3−N3− ions.

So the formula becomes Ca3N2Ca3N2

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