Asked Apr 15, 2019

When a β+ is emitted from an unstable nucleus,

 True/False-  the atomic number of the nucleus does not change. 
 True/False-  a neutron is ejected from the nucleus. 
 True/False-  a proton is ejected from the nucleus. 
 True/False-  a proton is transformed to a neutron. 
 True/False-  a neutron is transformed to a proton. 
 True/False-  the atomic number of the nucleus increases by 1. 
 True/False-  the atomic number of the nucleus decreases by 1. 


Expert Answer

Step 1

All the atoms which are heavier than hydrogen atom consist of a nucleus which contains protons (positively charged particles ) and neutrons (neutral) particles , which are surrounded by electrons (negatively charged particles).

In   beta plus decay , a proton present in the parent nucleus of an atom decays into a neutron which remains in the daughter nucleus and thus nucleus emits a positron and a neutrino. A positron is a similar particle like electron but it has a positive charge and same mass as that of the electron. This means that the positive beta decay is responsible for producing a daughter nucleus whose atomic number is one less than the corresponding parent atom provided the mass number remains the same.

Step 2

The given statement is false as the atomic number of the nucleus changes and gets reduced by one since the resulting nucleus contains one less proton and we know that the atomic number of an atom is equal to its number of protons or electrons.

Step 3

The given statement is false as during beta-plus decay , proton is ejected by the nucle...

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