Discovery of the Atom
This experiment showed that atoms have a small, dense center called the nucleus.
Gold foil experiment
This subatomic particle has a positive charge and is found in the nucleus of an atom
Proton
The arrangement of elements based on increasing atomic number.
The Periodic Table
When an atom has more electrons than protons, it has this type of charge.
Negative
This experiment showed that electrons have a negative charge.
Cathode ray tube experiment
This subatomic particle has no charge and also resides in the nucleus of an atom
Neutron
This element has 1 proton and is the lightest element in the periodic table.
Hydrogen
When an atom gains or loses electrons, it becomes this.
Ion
This scientist developed the model where electrons move around the nucleus in fixed orbits, like planets around the sun.
Niels Bohr
This negatively charged particle orbits around the nucleus of an atom
Electron
This element has 6 protons and is found in all living things.
Carbon
When an atom loses electrons, it becomes this type of ion.
Positive Ion or Cation
This scientist discovered the electron.
J. J. Thompson
This is the central part of an atom, containing protons and neutrons.
Nucleus
This group of elements on the periodic table is known for being nonreactive gases.
Noble Gases
These are atoms of the same element that have the same number of protons but a different number of neutrons.
Isotope
This scientist discovered that atoms have a small, dense nucleus at their center.
Ernest Rutherford
The number of these in an atom determines what element it is. It also equals the atomic number.
Protons
This element has the symbol Na and is found in table salt.
Sodium
This is the term for an ion that has a negative charge because it has gained electrons.
Anion