chemistry scientists

Question 0

Dalton

Answer 0

• indestructible ball model
• elements are made of tiny spheres called atoms.
• all atoms in an element are identical.
• the atoms of a given element are different than atoms of another element.
• atoms of one element can combine with atoms of other elements to form compounds.
• atoms cannot be created or divided into smaller particles.

Question 1

Democritus

Answer 1

• All matter composed of atoms too small to be seen.
• Atoms are completely homogenous solids.
• Atoms are indestructible.

Question 2

J.j. Thompson

Answer 2

• plum pudding model
• cathode ray experiment
• discovered electron and the negative charge on it.

Question 3

Rutherford

Answer 3

• mini universe model
• gold foil experiment
• shot alpha particles through a thin layer of foul.
• proved atoms have sense nucleus.
• also proved atoms have a lot of space in them.

Question 4

Millikan

Answer 4

• oil drop experiment
• discovered charge of electron (1.6x10^-18 coulomb)
• discovered mass of an electron(9.11x10^-31kg)

Question 5

Bohr

Answer 5

• father of quantum atomic theory
• mathematically proved that electrons exist in quantized orbital shells surrounding nucleus
• electrons orbit nucleus like plants orbit sun.
• -explained electron in a new way
• -accounted for small, dense, positive atomic nucleus.
• -accounted for all lines observed in the spectrum of the H atom.

Question 6

Schrödinger

Answer 6

• wave equation
• described atomic and subatomic systems, atoms and electrons
• told highest probability of finding atoms