Shared Flashcard Set

Details

Chapters 18 & 19
Vocabulary Terms
17
Science
9th Grade
01/22/2013

Additional Science Flashcards

 


 

Cards

Term
atomic spectrum
Definition
the pattern of frequencies of electromagnetic radiation emitted by the atoms of an element, considered to be an element's "fingerprint"
Term
conceptual model
Definition
a representation of a system that helps us predict how the system behaves
Term
physical model
Definition
a representation of an object on a different scale
Term
princibal quantum number
Definition
an integer that specifies the quantized energy level of an atomic orbital
Term
quantum
Definition
a small discrete packet of light energy
Term
quantum hypothesis
Definition
the idea that light energy is contained in discrete packets called quanta
Term
shell
Definition
a region of space in which an electrion may be located around the nucleus
Term
spectroscope
Definition
a device that uses a prism or diffraction grating to separate light into its color components
Term
valence electrons
Definition
the electrons of the outermost shell of an atom
Term
alpha particle
Definition
a helium atom nucleus which consists of two neutrons and two protons and is ejected by certain radioactive elements
Term
beta particle
Definition
an electron ejected from an atomic nucleus during the radioactive decay of certain nuclei
Term
carbon-14 dating
Definition
the process of estimating the age of once-living material by measuring the amount of a radioactive isotope of carbon present in the material
Term
gamma radiation
Definition
high-energy radiation emitted by the nuclei of radioactive atoms
Term
half-life
Definition
the time required for half the atoms in a sample of a radioactive isotope to decay
Term
radioactive
Definition
the tendency of some elements such as uranium to emit radiation as a result of changes in the atomic nucleus
Term
stromg nuclear force
Definition
the force of interaction between all nucleons effective only at very, very, very, very close distances
Term
transmutation
Definition
the conversion of an atomic nucleus of one element to an atomic nucleus of another element through a loss or gain of protons
Supporting users have an ad free experience!