Unit 2 Flashcards
Plank’s quantum theory
- heated objects emit light
- “black body problem” or “UV catastrophe”
- all electromagnetic energy is quantized
photoelectric effect
- identities photons of light
- used by Einstein
neils bohr
e- are found in specific orbits around the nucleus
balmer
studied the e- transitions in H (refraction emission spectrum of H)
heisenberg
there is a limit to what we know about a quantum system
broglie
matter & radiation have properties of waves & particles
schrödinger
developed an equation to describe the wave function of a system
pauli exclusion principle
each e- has its own “address” in an atom
aufbaw principle
e- are added from lowest–>highest E
hund’s rule
every orbital is singly filled before it can be doubly filled
mendeleev & meyer
electron config. & periodic table arranged by atomic mass & chemical reactivity
moseley
relationship between x-ray diffraction & # P
isoelectronic
same # e-
i.e. O^(2-) : [Ne]
in e- config., transition metals
lose their S electrons first
metallic character
increases: left/down