Atoms and Molecules
- History of the Atom
- Models for the Atom
- Subatomic Particles
- Periodic Table
- Periodic Trends
- Polyatomic Ions
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|Atoms and Molecules - Periodic Trends|
Study the primary definition of this concept, broken into general, basic, and advanced English definitions. Also see the mathematical definition and any requisite background information, such as conditions or previous definitions.
The first electron affinity is the energy released when one mole of gaseous atoms each aquire an electron to form one mole of gaseous 1- ions.
The energy change that occurs as an atom or negative ion accepts an electron. The first electron affinity applies to a neutral atom combining with an electron; the second electron affinity applies to a minus-one ion accepting an electron; etc. Sometimes defined as negative when the negative ion is more stable than the neutral atom and sometimes defined as positive for the same circumstance; check the definition in any source of data.
Atom(g) + electron- → Anion-(g) + energy(electron affinity)
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A visual representation of the changes in electron affinity as one moves down and across the periodic table.
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