4.1 Development of the Atomic Theory

Question 1

the smallest unit of an element that maintains the properties of that element

Answer 1

atom

Question 2

a subatomic particle that has a negative charge

Answer 2

electron

Question 3

in physical science, an atom’s central region, which is made up of protons and neutrons

Answer 3

nucleus

Question 4

a region around the nucleus of an atom where electrons are likely to be found

Answer 4

electron cloud

Question 5

(440 BCE) Greek philosopher who thought you could keep cutting a piece of paper until the particle could not be cut and called that particle an atom

Answer 5

Democritus

Question 6

Greek philosopher who thought that you would never end up with a particle that could not be cut

Answer 6

Aristotle

Question 7

(late 1700s) British chemist and school teacher who found out that elements combine in certain proportions because they are made of single atoms

Answer 7

Dalton

Question 8

(1897) British scientist who discovered electrons (with Cathode-Ray Tube Experiment)

Answer 8

Thomson

Question 9

(1909) former student of Thomson who discovered that atoms are mostly empty space with a dense, positive nucleus (with Shooting Gallery Experiment/Gold Foil Experiment)

Answer 9

Rutherford

Question 10

(1913) Danish scientist who proposed that electrons are located in certain levels at certain distances from the nuleus

Answer 10

Bhor

Question 11

Thomson’s model of the atom where the electrons are mixed throughout the atom

Answer 11

plum-pudding model

Question 12

what we would call the plum-pudding model today

Answer 12

chocolate chip ice-cream model

Question 13

in the middle of 2 objects

Answer 13

between

Question 14

some thing is to be true or ___ to happen

Answer 14

likely

Question 15

the Greek word that the word atom comes from that means not able to be divided

Answer 15

atomos