Atoms

Question 1

Atomic Theory

Answer 1

1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties
3) Compounds are formed by a combination of two or more different kinds of atoms.
4) A chemical reaction is a rearrangement of atoms.

Question 2

Democritus

Answer 2

Thought up Atoms (tiny, indivisible particles)

Question 3

Aristotle

Answer 3

Modified atoms theory stated that all matter was made of four elements: earth, fire, water, and air.

Question 4

John Dalton

Answer 4

Modern Atomic Theory. Show scientifically that the atom existed. (Law of conservation of mass and the law of constant composition)

Question 5

J.J. Thomson

Answer 5

Determined that there are pieces of atoms which resulted in them being called Electrons.

Question 6

William Thomson

Answer 6

“Plum Pudding” model.

Question 7

Ernest Rutherford

Answer 7

Shot alpha rays through gold foil. Thought of the Nucleus

Question 8

Niels Bohr

Answer 8

Planetary Model

Question 9

Planetary Model

Answer 9

Nucleus in the center and surrounding is orbital shells that hold the atom’s electrons

Question 10

Walter Bothe

Answer 10

Evidence of the neutron

Question 11

James Chadwick

Answer 11

Discovered the Neutron

Question 12

Law of Conservation of Matter

Answer 12

States that over the course of any chemical reaction the total mass of the system remains constant—Matter is neither created nor destroyed in chemical processes.

Question 13

Law of Constant or Definite Proportions

Answer 13

States that in a given compound, the constitutive elements are always present in a definite or fixed proportion by mass.