atomic structure Flashcards
name 3 atomic particles
- proton
- neutron
- electrons
who discovered the electron
thomson
what did thomson say
plum pudding model: the negatively charged electrons were embeded in a sphere of positive charge
who discovered the proton
rutherford
what did rutherford said
suggested electrons orbit a positively chrged nuc;leus. he called the positive charges protons
what did chadwick discover
the neutron
what did chadwick say
much later chadwick discovered neutrons. the neutron was more difficult to detect as it is neutral
radius of nucleus
less tham 1/10000th of that of the atom (less than 1x 10-14m)
radius of atom
about 0.1nm (1*10-10m)
atomic number
number of protons in an atom
mass number
number of protons and neutrons in an atom
why are atoms neutral
the number of protons equals the number of electrons
mass of the proton
1
mass of neutron
1
mass of elctron
1/1840
