Vocab
Atom
The smallest particle that still can be considered an element.
What are the parts of an atom?
Electron, Proton, Neutron, Nucleus
Who developed one of the first modern atomic theories?
John Dalton
Electrons
Tiny, negatively charged particles that move around the outside of the nucleus of an atom.
How many parts of an atom have?
4
What did John Dalton think atoms looked like?
Small, solid balls
Proton
A small, positively charged particle found in the nucleus of an atom.
What is an Isotope?
Isotope :An atom with the same number of protons but a different number of neutrons than other atoms of the same element.
Which scientist performed the gold foil experiment?
Rutherford
Nucleus
The central core of an atom, which contains protons and neutrons.
The number of protons in the nucleus of an atom is ?
Atomic Number
What did Rutherford discover was at the center of the atom?
Nucleus
Neutron
A small particle found in the nucleus of an atom.
What is the charge of a proton?
Positive
Why did atomic models change over time?
Scientists found new evidence