History and Structure of the Atom

Atoms of the same elements that have different masses

Created the plum pudding model

Found in nucleus

Brass

Smallest part of an element that still has the properties of that element

Mass number of chlorine

Number of protons in chlorine

Extensive physical property

Homogeneous mixture

Protons plus neutrons

First to work with cathode ray tubes

Particles in this phase of matter have complete freedom of motion

Solid to a gas

Proposed that electrons orbited the nucleus

Performed the gold foil experiment

Discovered the neutron

Cannot be broken down by physical means

Italian dressing

Unopened soda

Have no electrical charge

Found the charge of the electron

Separation method based on boiling points

Discovered the electron

Chemical property

Number of electrons in chlorine

Thought there were four "substances"--earth, fire, air and water

This phase of matter has a definite shape and volume

Have no mass

Was an English schoolteacher

Solid to a liquid

To separate a solid dissolved in a liquid, you would use

Number of neutrons in chlorine

1000 m

Discovered the proton

Developed the first atomic theory

Two or more elements chemically combined

Milk

Mixture of two metals

Occurs throughout the liquid

An element has 2 isotopes, 28amu-25% abundance, 29amu-75% abundance, the average atomic mass is

Intensive physical property

Salt water

Consists of only one kind of matter

Atomic number

Proposed that matter was mostly empty space