more little things for unit 1 Flashcards
what is the em spectrum in order of increasing wavelength
gamma, x ray, uv, visible, infrared, microwaves, radio and tv waves
what is the formula for calculating frequency when you know the wavelength and the speed
c = f lamda
what is meant by wave particle duality
em radiation can be regarded as a stream of very small particles called photons. so it can behave as both a wave and a partilcle
how can you calculate the energy of photons of radiation
e = planks constant times by frequency
how can you calculate energy of a wave from avogradros number, planks constant, speed and wavelength
e = avo times plank times speed dividied by wavelength
what do the dark lines on line absorption spectrum represent
the certain wavelengths that have been removed by absorption
what do the lines on line emission spectra represent
distinct wavelength of emitted light
what happens when atoms absorb energy
they become excited
what happens when energy is absorbed
the electrons move up to an outer shell. when they move to a lower energy level, a photon is released as a particular wavelength of light. so when electrons fall back and produce these photons, a line on emission spectra is formed from the energy difference.
what regions of the em spectrum does hydrogen have lines
uv, visible and IR
what is meant by ionisation energy
the energy difference between ground state and the convergence limit
how many subshells can each shell have
up to four.
s, p, d and f
what are the subshells in shell 1
1s
what are the subshells in shell 2
2s, 2p
what are the subshells in shell 3
3s, 3p, 3d
what are the subshells in shell 4+
4s, 4p, 4d, 4f, 5s, 5p, 5d, 5f, 6s, etc etc
which block does an atom with an l value of 0 belong in
s
