How many neutrons are emitted when a californium-249 nucleus (Z=98)is bombarded with a nitrogen-15 nucleus to produce a Db nucleus?

Question

How many neutrons are emitted when a californium-249 nucleus (Z=98)is bombarded with a nitrogen-15 nucleus to produce a  Db nucleus?

Quizplus · Accepted Answer

Californium-249 (Cf-249) has 249 nucleons. When it is bombarded with a nitrogen-15 (N-15) nucleus, it produces a dubnium-267 (Db-267) nucleus. 
The equation for the nuclear reaction is:
Cf-249 + N-15 → Db-267 + 4n
This means that four neutrons (4n) are emitted during the reaction, hence the correct answer is C) four.

How Many Neutrons Are Emitted When a Californium-249 Nucleus (Z=98)is