-A subatomic particle that has a negative (-) electrical charge

-The smallest , in terms of mass, of the three types of subatomic particles.

A subatomic particle that has a positive (+) electrical charge

A subatomic particle that has no charge associated with it: neutral

Is the small, dense, positively charged center of an atom.

Is any subatomic particle found in the nucleus of an atom

the region where it contains all of an atoms electrons. It accounts for volume of an atom, the electrons move rapidly about the nucleus.

The number of protons in an atom which is equal to the number of electrons

Approximately the same as the number of protons and neutrons(concentrated on the nucleus)

Are elemental forms that are chemically identical but have different types of nuclei, they are producing slightly differences in atomic weight thus having same chemical properties

Is simply it's total mass and is typically expressed in blank or blank

An average of the atomic masses of all the different isotopes in a sample, with each isotope's contribution to the average determined by how big a fraction of a sample it makes up

If two atoms have the same atomic weight or mass number but different atomic number

Element having the same number of neutrons

Proposed that all matter is composed of tiny indivisible particles (atomos = indivisible or indestructible)

English schoolteacher, Founder of the modern Atomic theory

Proposed that the atom is a sphere of ( +) particles to which are embedded (-) particles. Developed the raisin bread model or plum-pudding model

-Disproved Thomson's model by using the "Gold Foil/Film Experiment"

Cconcluded that:

-Atom is just an empty space

-The nucleus accounts for the (+) charge & mass of the atom

-Electrons are scattered around the nucleus

-Developed the "Nuclear Model"

-Developed the "Planetary model"

-The atom consists of nucleus surrounded by electrons traveling in circular orbits called orbitals

-Developed the "Quantum Mechanical Model"

-The electron moves in 3D space(electron cloud)

-Considered as the modern atomic structure