Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन
JEE Main & Advanced
Chemistry
Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन
Question Bank
Causes of radioactivity and Group displacement law
question_answer
After the emission of \[\alpha \]-particle from the atom \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be [MNR 1993; UPSEAT 1999, 2001, 02]
A) 138
B) 140
C) 144
D) 150
Correct Answer:
C
Solution :
\[_{92}{{X}^{238}}{{\xrightarrow{-\alpha }}_{90}}{{Y}^{234}}\] Number of neutrons = \[234-90=144\].