Question

The instability of the nucleus can be due to various cause.An unstable nucleus emits radiations if possible to transform into less unstable state.Then the cause and the result can be

• A. a nucleus of excess nucleons is $\alpha$ active
• B. an excited nucleus of excess protons is ${\beta }^{-}$ active
• C. an excited nucleus of excess protons is ${\beta }^{+}$ active
• D. an nucleus of excess neutrons is ${\beta }^{-}$ active

Answer 1

Answer: (A), (C), (D)

The correct options are
A a nucleus of excess nucleons is $\alpha$ active
C an excited nucleus of excess protons is ${\beta }^{+}$ active
D an nucleus of excess neutrons is ${\beta }^{-}$ active

1. A nucleus of excess nucleons is active:
${}_z{X}^A{\to }_{z-2}{Y}^{A-4}+\alpha$

2. An excited nucleus of excess protons is + active:
$_zX ^A \rightarrow _{z-1} Y^{A} + \beta ^{+}$

3. A nucleus of excess neutrons is active
${}_z{X}^A{\to }_{z+1}{Y}^A+{\beta }^{-}$