Chapter 4 Test

Question 1

Plum pudding model

Answer 1

Thomson

Question 2

Discovered existence of neutron

Answer 2

Chadwick

Question 3

Thought all atoms of same element had identical mass and chemical properties, but different from other elements

Answer 3

Dalton

Question 4

Ancient Greek philosopher who who said all matter is made of tiny, indivisible particles called atoms

Answer 4

Democritus

Question 5

Conducted an oil-drop experiment to determine the mass and charge of an electron

Answer 5

Millikan

Question 6

Gold foil experiment, determined that atoms are mostly empty space with a positive nucleus

Answer 6

Rutherford

Question 7

Originally stated that atoms separate, combine, and rearrange in chemical reactions so that matter is conserved

Answer 7

LaVoisier

Question 8

Originally said atoms of different elements combine in whole number ratios to form compounds

Answer 8

Proust

Question 9

Cathode repay, discovered existence of electrons

Answer 9

Thomson

Question 10

Average atomic mass formula

Answer 10

(Mass)(abundance)

Question 11

Ion

Answer 11

Charged particle

Question 12

Isotopes

Answer 12

Same amount of protons, different amount of neutrons

Question 13

Mass number formula

Answer 13

Protons + neutrons

Question 14

Bromine

Answer 14

Br

Question 15

Li

Answer 15

Lithium

Question 16

Ar

Answer 16

Argon

Question 17

I

Answer 17

Iodine

Question 18

Mg

Answer 18

Magnesium

Question 19

Lead

Answer 19

Pb

Question 20

Radioactivity

Answer 20

When a substance spontaneously emits radiation

Question 21

Stability depends on…

Answer 21

Number of protons and neutrons in the nucleus

Question 22

Radioactive decay

Answer 22

When unstable nuclei lose energy by emitting radiation

Question 23

Alpha particle

Answer 23

4
O<
2

Question 24

Beta particle

Answer 24

0
B
-1

Question 25

Said that empty space cannot exist

Answer 25

Aristotle

Question 26

Law of constant composition(definite proportions)

Answer 26

Proust

Question 27

There are particles smaller than the atom

Answer 27

Thomson

Question 28

Who identified electron

Answer 28

Thomson

Question 29

Discovered nucleus

Answer 29

Rutherford