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Atomic Theory
Atomic theory trends and terms
16
Chemistry
10th Grade
05/05/2026

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Term
electronegativity
Definition
the ability to attract electrons in a shared chemical bond
Term
ionization energy
Definition
the energy needed to remove an electron
Term
electron affinity
Definition
the energy change when an electron is added to a neutral atom
Term
atomic radius
Definition
the size of an atom
Term
Example of orbital notation
Definition
[image]
Term
Example of electron configuration
Definition
[image]
Term
Isotope
Definition
elements that share the same number of protons and electrons, but have different amounts of neutrons.
Term
Determined by the protons and neutrons
Definition
atomic mass
Term
Democritus
Definition
named the "atom" and claimed it was indivisible
Term
Dalton
Definition
compounds break down into the same proportions
Term
Thompson
Definition
discovered the electron
Term
Rutherford
Definition
named the nucleus
Term
Bohr
Definition
said electrons orbit the nucleus at a fixed distance
Term
Atomic Radius trend
Definition
Decreases as you go right; increases as you go down
Term
Ionization Energy, electronegativity and electron affinity trends
Definition
Increases as you go right, and decreases as you go down
Term
Electrons behave like waves
Definition
Bohr
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