Reason for why 2 3 H e is stable whereas 2 2 H e cannot be detected has to be explained. Concept Introduction: Nuclear stability means that the nucleus is stable meaning that it does not spontaneously emit any kind of radioactivity. Nuclear stability can be explained based on neutron proton ratio (N/Z) in the nucleus. For a stable atoms having low atomic number , N/Z ratio is close to 1. When atomic number increases N/Z becomes greater than 1. General rules for predicting the nuclear stability is given below, If the nucleus contains 2, 8,20,50,82 or 126 protons or neutrons, then they are generally considered as stable than the nuclei that do not possess these numbers. If the nuclei has even number of both protons and neutrons, then they are considered as stable as those with odd number of these particles. All isotopes of elements with atomic number higher than 83 are radioactive.

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Chapter 24, Problem 24.5P

Interpretation Introduction

Interpretation:

Reason for why $23He$ is stable whereas $22He$ cannot be detected has to be explained.

Concept Introduction:

Nuclear stability means that the nucleus is stable meaning that it does not spontaneously emit any kind of radioactivity.

Nuclear stability can be explained based on neutron proton ratio (N/Z) in the nucleus.

For a stable atoms having low atomic number, N/Z ratio is close to 1. When atomic number increases N/Z becomes greater than 1.

General rules for predicting the nuclear stability is given below,

If the nucleus contains 2, 8,20,50,82 or 126 protons or neutrons, then they are generally considered as stable than the nuclei that do not possess these numbers.

If the nuclei has even number of both protons and neutrons, then they are considered as stable as those with odd number of these particles.

All isotopes of elements with atomic number higher than 83 are radioactive.

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