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Nucleons
________ are the fundamental particles that make up the nucleus, protons, and neutrons.
Nuclear reactions
________ are frequently followed by a million- fold increase in energy.
Mercury
________ has seven, whereas tin has ten, the most of any element.
Polonium
________ (Po; Z= 84), the most metallic member of Group 6A, is a uranium ore (16), and the heaviest alkaline earth element, radium (Ra; Z= 88)
Electrons
________ are shared or transferred to produce compounds in chemical processes, while nuclei stay unaltered.
precise quantities
The isotopes of an element or its compounds are present in ________ that fluctuate only slightly in naturally occurring samples of the element or its compounds.
mass number
Nuclides can alternatively be identified by the element name followed by the ________, such as chlorine- 35 and chlorine- 37.
precise quantities of protons
Each nucleus has its own unique composition, that is, ________ and neutrons.
atomic nuclei
The changes that occur in ________ are very different from chemical changes.
Antoine Henri Becquerel
________, a French physicist, discovered by accident in 1896 that uranium crystals generate penetrating radiation capable of exposing a photographic plate.
nuclear processes
In ________, the roles are reversed: electrons play a significant role.
Curie
________ gave the emissions the term radioactivity and demonstrated that they are unaffected by temperature, pressure, or other physical and chemical conditions.
Pierre Curie
________ demonstrated the presence of two additional elements in pitchblende, the main element.
Becquerel
________ also discovered that radiation causes an electric discharge in the air, allowing him (Antoine- Henri Becquerel) to measure its intensity.
stable nucleus
Although a(n) ________ can exist indefinitely, the vast majority of nuclei are unstable.
Energy changes
________ in chemical processes are so significant that the associated changes in the mass are noticeable.
nuclide
A(n) ________ is denoted by the notation Z A X, where X is the element symbol.
mass number
The ________, A, is the number of nucleons (the sum of protons and neutrons)
