changes of state + the particle model+atoms+isotopes Flashcards
(35 cards)
what happens when we put energy in a system
solid into liquid(melting)
liquid into gas (evaporating)
what happens when energy comes out of a system
gas into liquid ( condensing)
liquid into solid(freezing)
what is the size of an atom in nanometers and meters
0.1-05nm and (1x10 to the power of -1) - (5x10 to the power of -10)m
what is the mass of a proton
1
what is the mass of a neutron
1
what is the mass of an electron
1/2000
what number is the mass number(on photo)
the larger number
what is the atomic number(on photo)
the smaller number
what is the mass number
the number of protons and neutrons
what is the atomic number
the number of protons
electrons in an atom
how do you find the number of neutrons(on photo)
mass number - atomic mass
how do you find the number of protons(on photo)
atomic number
what is an ion
an atom that has lost or gained electrons
what is an isotope
atom that has different number of neutrons
why has their been multiples changes to the model of the atom
due to new developments and new discoveries
what is the order of people that developed the model of the atoms
ancient greece dalton thompson rutherford chadwick bohr quantum physics
what did ancient greece believe
first discovered the atom
uncuttable
what did dalton believe
1800s
solid sphere
what did thompson believe
plum pudding model
what did rutherford believe
ppm and worked out it has a solid centre
what did bohr belive
the nucleur model of the atom that we use today
nulcues in the middle with shells
what did chadwick belive
added neutrons after rutherford
what was rutherfords gold foil experiment
took a sheet of gold foil
shot particles out of particle gun
majority of particles went straight through
ocasionally one deflected
ocasionally oe deflected back
-overall positive nucleus surrounded by negative charges around the outside, majority of atom was empty space
- this led to the nucleur model of the atom
what are the three types of radiation
alpha(helium nuclei)
beta(electron)
gamma(part of electrogmagnetic spectrum)
