Details

Title: Chapter 4

Description: The Structure of the Atom

Total Flash Cards: 20

Created: 09/24/2007 09:06:28

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Cards in this set:

Term
atom
 Definition
smallest part of an element that retains the properties of the element
Term
electron
 Definition
negatively charged subatomic particle
Term
nucleus
 Definition
dense, centrally located, mass of an atom
Term
proton
 Definition
positively charged subatomic particle in the nucleus
Term
neutron
 Definition
neutral subatomic particle in the nucleus
Term
atomic number
 Definition
number of protons in an atom
Term
isotope
 Definition
same number of protons, but different numbers of neutrons
Term
mass number
 Definition
sum of the protons and neutrons in the nucleus
Term
atomic mass unit (amu)
 Definition
one-twelfth the mass of a carbon-12 atom
Term
atomic mass
 Definition
weighted average mass of all isotopes of an element
Term
nuclear reaction
 Definition
involves a change in the nucleus
Term
radioactivity
 Definition
process of emitting radiation
Term
radiation
 Definition
rays and particles emitted by a radioactive material
Term
radioactive decay
 Definition
the spontaneous process of radioactivity
Term
alpha radiation
 Definition
deflected toward a negatively charged plate
Term
alpha particle
 Definition
two protons and two neutrons (2+ charge)
Term
nuclear equation
 Definition
shows atomic number and mass number of particles involved
Term
beta radiation
 Definition
deflected toward a positively charged plate
Term
beta particle
 Definition
an electron (1- charge)
Term
gamma ray
 Definition
high energy radiation with no mass or charge