Question
Asked Aug 3, 2019

The formation of krypton from rubidum decay is a result of ______.

A) alpha emission

B) beta emission

C) positron emission

D) electron capture

E) neutron capture

check_circleExpert Solution
Step 1

Alpha decay- It is type of radioactive decay in which an atomic nucleus releases an alpha particle (α). Alpha particle is actually a helium (He) nucleus and therefore the radioactive nucleus decays to another atomic nucleus with a mass number that is reduced by 4 and an atomic number that is reduced by 2.  

Beta decay- It is type of radioactive decay in which an atomic nucleus releases a Beta particle (β) nucleus and therefore decays to another atomic nucleus with a same mass number but atomic number that is increased by 1.  

Positron emission- It is beta plus decay (β +) which is a sub-type of β-decay. A positron () is like an electron but with positive charge. During positron emission, a proton changes into a neutron and the excess positive charge is emitted as positron.

General equation of Alpha decay-
A-
Z-2
General equation of Beta decay-
Z+
General equation of positron emission-
help_outline

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General equation of Alpha decay- A- Z-2 General equation of Beta decay- Z+ General equation of positron emission-

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Step 2

Electron capture- It is opposite of Beta decay. It captures a negative particle and results in forming a new nucleus with same mass number and atomic number that is reduced by 1.

Neutron capture- It is a nuclear reaction in which an atomic nucleus combines with a neutron to produce a heavier nucleus with a same atomic number but atomic mass that is increased by 1.

General equation of electron capture-
х + fе >4Y
Z-1
General equation of neutron capture-
х + дп > *у
help_outline

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General equation of electron capture- х + fе >4Y Z-1 General equation of neutron capture- х + дп > *у

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Step 3

Atomic number of Rubidium = 37

Mass number of Rubidium = 83

Atomic number of Krypton = 36

Mass number of Krypton = 83

There is net decrease...

83
Rb+ je-> gKr
36
37
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83 Rb+ je-> gKr 36 37

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