Bridging Course 1

Question 1

postulated that all matter is made up of small indestructive units called atoms

Answer 1

Democritus

Question 2

proposed his atomic theory.
1. Each element is made up of atoms.
2. Atoms of a given element are identical.
3. Compounds are formed when atoms
Shal combine with each other.
4. Chemical reactions involve
reorganization of the atoms.

Answer 2

John Dalton

Question 3

created the periodic table and discovered that the properties of elements were periodic functions of their atomic weights

Answer 3

Dmitri Mendeleev

Question 4

proposed the theory of electromagnetism and made the connection between light and electromagnetic waves.

Answer 4

James Clerk Maxwell

Question 5

proposed that electricity was made of discrete negative particles called electrons

Answer 5

George Stoney

Question 6

made experiments with cathode ray tubes demonstrating that cathode rays have a negative charge

Answer 6

Sir William Crooke

Question 7

used cathode ray tubes to study canal rays which had electrical and magnetic properties opposite of an electron

Answer 7

Eugene Goldstein

Question 8

discovered that certain chemicals glowed when exposed to cathode rays. He named these X-rays.

Answer 8

Wilhelm Roentgen

Question 9

discovered radiation by studying the effects of X-rays on photographic film

Answer 9

Henri Becquerel

Question 10

used cathode ray tubes to determine the charge to mass ratio of an electron

Answer 10

Sir Joseph John Thomson

Question 11

discovered alpha, beta, and gamma rays in radiation.

Answer 11

Ernest Rutherford

Question 12

theorized that radioactive particles cause atoms to break down releasing radiation that takes the form of energy and subatomic particles. They discovered the radioactive elements polonium and radium

Answer 12

Pierre and Marie Curie

Question 13

proposed the idea of quantization to explain how a hot, glowing object emitted light.

Answer 13

Max Planck

Question 14

discovered that there appeared to be more than one element at each position on the periodic table. The term isotope was coined by ______________ as a suitable name for these elements.

Answer 14

Frederick Soddy; Margaret Todd

Question 15

found that noble gases have stable electron configurations

Answer 15

Richard Abegg

Question 16

created the theories of relativity and hypothesized about the particle nature of light.

Answer 16

Albert Einstein

Question 17

invented a device that could detect alpha particles

Answer 17

Hans Geiger

Question 18

determined the charge of an electron through his oil drop experiment

Answer 18

Robert Millikan

Question 19

performed the alpha particle experiment and established that the nucleus was very dense, very small, and positively charged.

Answer 19

Ernest Rutherford

Question 20

discovered that the number of protons in an element determines its atomic number.

Answer 20

Henry Moseley

Question 21

developed the Bohr atomic model, with electrons travelling in orbits around the nucleus.

Answer 21

Neils Bohr

Question 22

proposed that electrons have a wave-particle duality.

Answer 22

Louis de Broglie

Question 23

developed the Schrodinger equation which describes how the quantum state of a system changes with time.

Answer 23

Erwin Schrodinger

Question 24

atomic model proposed by John Dalton

Answer 24

Dalton’s Billiard Ball Model

Question 25

the atomic model proposed by JJ Thomson

Answer 25

Thomson’s Plum Pudding Model

Question 26

the atomic model proposed by Rutherford

Answer 26

Rutherford’s Nuclear Model

Question 27

the atomic model proposed by Bohr

Answer 27

Bohr’s Planetary Model

Question 28

proposed the law of triads in arranging the periodic table

Answer 28

Johann Dobereiner

Question 29

proposed the law of octaves in arranging the periodic table

Answer 29

John Newlands

Question 30

recognized the repeating pattern or the periodic behavior among elements. ________ studied the relationship of the atomic volume and the relative atomic mass of 28 elements.

Answer 30

Lothar Meyer

Question 31

formulated the periodic law. __________ the properties of the elements are periodic functions of their atomic masses.

Answer 31

Dmitri Mendeleev

Question 32

find out that wavelengths of the X-ray emissions of the elements coincided with the ordering of the elements by atomic number.

Answer 32

Henry Moseley