Question

A radioactive element _ZX^A emits an a-particle and changes into-

• A. _{z 2}Y^A
• B. _zY^A–4
• C. _z–2Y^A–4
• D. _z+2Y^A

Answer 1

_ZX^A ® _Z–2Y^A–4 + ₂a⁴