Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
1st Edition
ISBN: 9780078945830
Author: Charles William McLaughlin, Marilyn Thompson, Dinah Zike
Publisher: Glencoe Mcgraw-Hill
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Concept explainers
Question
Chapter 20.1, Problem 4R
To determine
Whether 
is radioactive or stable.
Expert Solution & Answer
Answer to Problem 4R
is radioactive.
Explanation of Solution
Stable helium has two protons and two neutrons in the nucleus and thus has an atomic weight of 
This is a very small and a light nucleus. Thus, adding or subtracting even one neutron from its nucleus will have large effect on its stability. Adding two neutrons would cause 
increase in its atomic weight which will hinder its stability.
Conclusion:
is radioactive and highly unstable having half-life span of 
Chapter 20 Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
Ch. 20.1 - Prob. 1RCh. 20.1 - Prob. 2RCh. 20.1 - Prob. 3RCh. 20.1 - Prob. 4RCh. 20.1 - Prob. 5RCh. 20.2 - Prob. 6PPCh. 20.2 - Prob. 7PPCh. 20.2 - Prob. 8RCh. 20.2 - Prob. 9RCh. 20.2 - Prob. 10R
Ch. 20.2 - Prob. 11RCh. 20.2 - Prob. 12RCh. 20.3 - Prob. 13RCh. 20.3 - Prob. 14RCh. 20.3 - Prob. 15RCh. 20.3 - Prob. 16RCh. 20.3 - Prob. 17RCh. 20.3 - Prob. 18RCh. 20 - Prob. 19RCh. 20 - Prob. 20RCh. 20 - Prob. 21RCh. 20 - Prob. 22RCh. 20 - Prob. 23RCh. 20 - Prob. 24RCh. 20 - Prob. 25RCh. 20 - Prob. 26RCh. 20 - Prob. 27RCh. 20 - Prob. 28RCh. 20 - Prob. 29RCh. 20 - Prob. 31RCh. 20 - Prob. 32RCh. 20 - Prob. 33RCh. 20 - Prob. 34RCh. 20 - Prob. 35RCh. 20 - Prob. 36RCh. 20 - Prob. 37RCh. 20 - Prob. 38RCh. 20 - Prob. 39RCh. 20 - Prob. 40RCh. 20 - Prob. 41RCh. 20 - Prob. 42RCh. 20 - Prob. 43RCh. 20 - Prob. 44RCh. 20 - Prob. 1STPCh. 20 - Prob. 2STPCh. 20 - Prob. 3STPCh. 20 - Prob. 4STPCh. 20 - Prob. 5STPCh. 20 - Prob. 6STPCh. 20 - Prob. 7STPCh. 20 - Prob. 8STPCh. 20 - Prob. 9STPCh. 20 - Prob. 10STPCh. 20 - Prob. 11STPCh. 20 - Prob. 12STPCh. 20 - Prob. 13STPCh. 20 - Prob. 14STPCh. 20 - Prob. 15STPCh. 20 - Prob. 16STPCh. 20 - Prob. 17STPCh. 20 - Prob. 18STPCh. 20 - Prob. 19STPCh. 20 - Prob. 20STPCh. 20 - Prob. 21STP
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