Examlex
All of the following are strong factors in getting adolescents to start smoking EXCEPT
Valence Electrons
The electrons in the outer electron shell, known as the valence shell, of an atom; in the formation of a chemical bond, an atom can accept electrons into its valence shell or donate or share valence electrons.
Isotopes
Variants of a particular chemical element that differ in neutron number, and consequently in mass, but not in chemical properties.
Radioisotope
A radioactive isotope of an element, used in various scientific applications including medicine and radiometric dating.
Stable Isotope
A non-radioactive form of an element’s isotope, which does not change or decay over time.
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