Lecture-2-Chemistry-_42283

Atomicmass alsomanyapplicationsin ofprotonsofneutrons

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Unformatted text preview: roperties • Elements are neutral: – can be detected; use as # electrons = # protons tracers to follow molecules • Atomic number = # of protons in biological reactions. • Atomic mass = Also, many applications in # of protons + # of neutrons medicine. • Radioisotopes: unstable nuclei, decay giving off energy/matter. Electrons Have Potential Energy • Potential energy: energy due to the arrangement or position of matter – An electron’s potential energy is proportional to its’ distance from the nucleus; determined by which energy level or shell the electrons occupy Energy absorbed by an atom can result in electrons moving to higher levels (shells), or even out of the atom altogether. EX: Photosynthesis Electron transfers between molecules = transfers of energy; these processes fuel metabolism. Distribution of Electrons in an Atom • Electrons are in constant motion around the nucleus; occupy regions called orbitals, and these occur in discrete layers around the...
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