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Standard VII

Chemistry

Sub-Atomic Particles

During the em...

Question

During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number :

is decreased by 1 unit

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is decreased by 2 units

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is increased by 1 unit

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remains unchanged

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Solution

The correct option is A is decreased by 1 unit
When a positron is emitted, a proton is converted into neutron and neutrino. Thus, the number of protons and hence the atomic number decreases by one unit.
$\begin{matrix} _{1}^{1} H P r o t o n \end{matrix} ⟶ \begin{matrix} _{0}^{1} n N e u t r o n \end{matrix} + \begin{matrix} _{1} {e^{0}} P o s i t r o n \end{matrix} + \begin{matrix} v N e u t r i n o \end{matrix}$

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Similar questions

Q. STATEMENT - 1 :

_{Z} X^{A}

undergoes 2

α

decays, 2

β

decays (negative

β

) and 2 decays. As a result the daughter product is

_{Z - 2} Y^{A - 8} .

STATEMENT -2 : In

α

decay the mass number decreases by 4 unit and atomic number decreases by 2 unit. In

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Q. Assertion :

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Reason: In

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, the mass number decreases by 4 unit and atomic number decreases by 2 unit. In

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undergoes

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α

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Q. When an electron is emitted, the mass number remains unchanged but atomic number increases by one unit. Nuclear reaction is:

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During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic number :

The correct option is A is decreased by 1 unitWhen a positron is emitted, a proton is converted into neutron and neutrino. Thus, the number of protons and hence the atomic number decreases by one unit.11HProton⟶10nNeutron+1e0Positron+vNeutrino