Isotopes + Periodic Table + Atomic Weight (Slides 14–17)
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12 Terms
Isotope
An atom of an element that differs from other atoms of the same element in its number of neutrons
What is the same in isotopes?
The number of protons
What is different in isotopes?
The number of neutrons
Radioactive isotope
An isotope that decays spontaneously and gives off particles and energy
What are some uses of radioactive isotopes?
Dating fossils
Radiometric dating
Using radioactive isotope decay to estimate the age of an object
What happens to Carbon-14 over time?
It decays into Nitrogen-14
Periodic table
A table that organizes the elements and shows their atomic numbers and atomic masses
Atomic weight
The weighted average mass of an element's naturally occurring isotopes
What information is needed to calculate atomic weight?
The mass and percent abundance of each naturally occurring isotope
Atomic weight formula
Sum of (isotope abundance × isotope mass)
What does the symbol Σ mean?
Summation of the terms over all naturally occurring isotope