chapter 24 Flashcards
what is daltons atomic theory
- all elements are composed of atoms and all atoms of a given element are identical in size, mass, and chemical properties
- all compounds are composed of atoms of more than one element
- a given chemical reaction involves only the separation, combination, or rearrangement of atoms, it does not result in the creation or destruction of atoms
what is the mass of a proton
1 amu or 1 dalton
what happens to energy when electrons are excited
it is absorbed
what happens to energy when electrons return to ground state
it is emitted
what are the quantum numbers
n, l, ml, and ms
what does the principal quantum number tell us
the shell where an electron is present
what does the azimuthal quantum number tell us
the shape of the orbitals and refers to the subshells that occur within the principal energy level
what is another name for the azimuthal quantum number
the angular momentum quantum number
what does the magnetic quantum number tell us
describes the orientation of the orbital in space
what does the spin quantum number tell us
the spin of the electron
what does diamagnetic mean
materials that have no parallel spins are slightly repelled by a magnetic field
what does paramagnetic mean
materials with unpaired elections and are attracted to magnetic fields
explain Planck’s quantum theory
energy emitted as electromagnetic radiation from matter comes in discrete bundles called quanta
explain the bohr model
he assumed that the hydrogen atom consisted of a central proton around which an electron traveled in a circular orbit and that centripetal force acting on the electron as it revolved around the nucleus was the electrical force between the positively charged proton and the negatively charged electron
what are the balmer series
four wavelengths in the visible region
