atomic structure and isotopes Flashcards
1
Q
nucleus
A
protons and neutrons
2
Q
electrons
A
orbit nucleus in shells
3
Q
John dalton
A
atoms are spheres each element is ma from a different sphere
4
Q
JJ Thompson
A
discovered the electron sod the plum pudding model
5
Q
Rutherford
A
small and there’s a nucleus atom is mainly empty space
6
Q
gold lead experiment
A
positive alpha particles are fired at thin gold leaf
most particles went through the gold leaf so atom is mainly empty space
small no defected back - negative electrons
7
Q
Niels Bohr
A
fixed energy shells
8
Q
relative atomic mass
A
weighted mean mass of an atom of an element compared to 1/12 of the mass of an atom of carbon. 12
9
Q
relative isotopic mass
A
mass of an atom of an isotope compared to 1/12 of the mass of an atom of carbon. 12
