Atomic Structure Flashcards
What did dalton do
all elements made up of small particles called atoms
What did JJ Thompson do
Plum pudding model, stated negative electrons embedded in a positive sphere
What did Rutherford do
model had negative electrons orbiting a positive nucleus.
What’s did Chadwick do
Discovered the neutron
What are atoms like in the present day
protons and neutrons in the nucleus and electrons orbit around in shells
What’s the atomic number
Atomic number this is the number of protons in an atom.
What’s the atomic mass
Mass number this is the total number of protons and neutrons in (the nucleus of) an atom.
What are isotopes
Isotopes are atoms which have the same number of protons but they have a different
number of neutrons.
What are ions
When atoms either lose or gain
electrons they form ions
What are cations
These are positive ions and form
when atoms lose electrons.
What are anions
These are negative ions and form
when atoms gain electrons.
