Atomic Structure Physical Science Advanced

Laid the foundation for the modern quantum theory

neutrons in oxygen?

An atom in the ground state has less energy and is less stable than an atom in an excited state

Takes up most of the volume of the atom.

Rutherford

Neutrons in Titanium?

Unlike protons and electrons, neutrons have no charge. 

Discovered by Eugene Goldstein

lowest possible energy level 

Word coined by Democritus for tiny piece of matter that cannot be divided. 

Bohr's model was correct in assigning energy levels to electrons.

Electrons in phosphorus?

Ions have lost or gained __.

In Niels Bohr's atomic model electrons move___.

Protons in Lithium?

Rutherford

Negatively charged subatomic particle

What is "18" in oxygen - 18?

When atoms gain or lose energy their ____ may move to different energy levels.

Thought all substances were built from only four elements - earth, air, fire and water. 

Atoms are normally neutral because they contain the same number of protons and electrons. 

JJ Thomson

The number of protons in an atom of an element is its ___.

Bohr's model focused on

Isotopes of the same element contain different numbers of ___.

NOT part of John Dalton's original, unrevised atomic theory.