Unit 2 Concepts Flashcards
Properties of nonmetals
matte, brittle, hard, various states at room temp, not malleable, not ductile, poor
conductors
Properties of metals
shiny, solids at room temp, ductile (drawn into wires), malleable (pounded into shapes),
good conductors
Properties of metalloids
depends on conditions, semi-conductors (good only at high temps)
Inversely or directly proportional: speed of light = wavelength*frequency
inversely proportional
Inversely or directly proportional: Energy = Planck’s constant*frequency
directly proportional
Inversely or directly proportional: Energy = (Planck’s constant*speed of light)/wavelength
inversely proportional
Amplitude of a wave
height from middle to crest
Frequency of a wave
number of oscillations in one second
wavelength
measured from crest to crest
ionic bond
a bond that involves donating electrons between atoms
covalent bond
a bond that involves sharing electrons between atoms
ionic vs molecular compounds
ionic: uses ionic bonds, ending up with cations and anions
molecular: uses covalent bonds
Used cathode rays to discover electrons
Thomson
Used gold foil and alpha particles to discover the nucleus and protons
Rutherford
Discovered neutrons
Chadwick
Number of electrons that can be in an orbital
2 electrons
