Atomic Theoryists

Question 1

What did Democritus say(4)

Answer 1

•atoms are small, hard particles. • uncuttable• constantly moving• atoms are made up of a single material and form into different shapes and sizes

Question 2

When was dalton

Answer 2

1803

Question 3

What did dalton say(7)

Answer 3

•atoms of different elements are different• combined elements• atoms of the same element are exactly alike.• all substances made of atoms. • elements combine in specific proportions. • atoms can’t be created, divided, or destroyed

Question 4

When was Thomson

Answer 4

1897

Question 5

What did Thomson say(6)

Answer 5

• negatively charged particles in atoms. • cathode ray tube experiment.• plum pudding model• he called negatively charged particles corpuscles• he didn’t know where negative or positive charged particles were so he called it plum pudding• atoms can be divided into smaller pieces

Question 6

When was Rutherford

Answer 6

1911

Question 7

Rutherford(7)

Answer 7

•gold foil• results of gold foil show that plum pudding isn’t accurate• nucleus• most of atoms mass is the nucleus• atoms contain mostly empty space• electrons move in empty space• nucleus is at center of atom and surrounded by empty space

Question 8

When was Bohr

Answer 8

1913

Question 9

Bohr(3)

Answer 9

• electrons jump between levels from path to path• electrons travel in different paths •electron paths are found in levels at certain distances from nucleus;no path between levels

Question 10

When was Schrodinger/ Heisenberg

Answer 10

1926

Question 11

Schrodinger/ Heisenberg

Answer 11

• electron paths can’t be predicted• electrons are found in electron clouds, not paths• electron clouds are related to the paths in bohrs model• electron clouds are certain regions inside atoms where electrons can be found

Question 12

When was Democritus

Answer 12

440 BC