C1-atomic structure Flashcards
who published their ideas about atoms in 1803?
John dalton
who discovered the electron?
JJ thompson
who created the plum pudding model?
JJ thompson
what was the logic behind the plum pudding model?
the atom is a ball of positive charge with negative electrons embedded in it - like currants in a Christmas pudding.
who performed the alpha particles gold foil experiment?
Ernest Rutherford
what did Rutherfords experiment show?
- the mass of an atom is concentrated at the centre, the nucleus
- the nucleus is positively charged
who created the bohr model?
Niels Bohr
what did the bohr model show?
electrons orbit the nucleus on fixed electron shells
who discovered the neutron?
James chadwick
what are the three subatomic particles?
electrons, protons, neutrons
what is the relative charge for an electron?
-1
what is the relative charge for a neutron?
0
what is the relative charge for a proton?
+1
what determines the atomic number of an element?
amount of protons/electrons
how do you calculate the amount of neutrons?
mass number-atomic number
