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Chapter 3ish, 4, 5, 6.1

Terms

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Pauli's exclusion principle
an atomic orbital may describe at most 2 electrons
wavelength
distance between crests
Alkali metals
group 1A metals
atomic orbital
region of space where there's a high probability of finding an electron
Density
ratio of mass of an object to its volume
Periodic Law
Whene elements are arranged in order of atomic number, there is periodic repitition of their properties
Photons
Light quanta
Hund's rule
electrons occupy orbitals of same energy so electrons with the same spin are as many as possible
electron configuration
way in which electrons are arranged in various orbitals around the nucleus
Nucleus
tiny central core of an atom
nonmetals
bad conductors of heat and electric currents
Noble gases
elements in group 8A
atomic mass unit
one 12th of the mass of a carbon 12 atom
amplitude
waves height from zero to the crest
Metalloids
contain properties of both non-metals and metals
protons
positively charged subatomic particles
frequency
# of wave cycles to pass at a given moment
isotopes
atoms that have the same number of protons but a different number of neutrons
Alkali Earth metals
Group 2A metals
Inner transition metals
have F sublevels containing electrons
Spectrum
When sunlight passes through a prism and creates frequencys
Metals
good conductors of heat and electric currents
Halogens
nonmetals of group 7A
Ground State
Lowest possible energy of an electron
Transition Metals
atoms have hights S and D containing electrons
aufbau principle
electrons occupy the orbitals of lowest energy first
Atom
smallest particle of an element that retains identity in chemical reactions
electrons
negatively charged subatomic particles
quantum mechanics model
modern description of electrons in atoms
Hertz
SI unit of cycles per second
Electromagnetic Radiation
radio waves, microwaves, and all other 'wave' words
neutron
subatomic particles with no charge
Heisenberg uncertainty principle
it is impossible to know volocity and position at the same time
energy levels
the fixed energies that an electron can have
atomic number
number of protons in a nucleus of an atom
quantum
amount of energy required to move an electron from one energy level to another
Representative elements
elements in groups 1A to 7A

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