The Atom

Question 1

Law of constant composition

Answer 1

a compound always contains atoms of two or more elements combined in definitw porportions of mass and composition

Question 2

Law of multiple prportions

Answer 2

atoms with 2 or more elements that may combine in differnt ratios
ex: NO, NO2, N2O

Question 3

Daltons atomic theory

Answer 3

1. indivisible and indestructible particles
2. atoms of same elements have same masses
3. atoms of different elements have different masses
4. atoms combine in whole number ratios

Question 4

Objections to Daltons theory

Answer 4

• atoms are not indivisible– subatomic particles

- not all atoms of same elements have same masses– isoptopes

Question 5

JJ Thompson

Answer 5

• Cathode Ray:electron
• plum pudding : electrons are scattered unevenly and surrounded by positive charge to balance negative
• established presence of proton

Question 6

Oil Drop Experiment

Answer 6

• Milikan

- by varying charges on plates, found that he could suspend the drops of oil

Question 7

Proton

Answer 7

• e goldstein

Question 8

Ernest Rutherford

Answer 8

• Gold foil

- concluded that atoms have empty space and a nucleus

Question 9

Subatomic Particles

Answer 9

• neutrons

Question 10

Niels Bohr

Answer 10

• bohr model

- electrons move in definite orbitals around the nucleus

Question 11

Particle Wave Dulaity

Answer 11

-Einstein

-

Question 12

Uncertainity Pribicple

Answer 12

• Heisenbrg

- impossible to know the location and momentum of an electron and the best that can be done is finding the probability

Question 13

Edwin Schoedinger

Answer 13

• propsed electrons are waves

Question 14

Aufbau Principle

Answer 14

lowest energy possible

Question 15

Pauli exclusion principle

Answer 15

want space to minimize repulsion (2 electrons per orbital)

Question 16

Hunds rule of Maximum multiplicity

Answer 16

filll up the spaces only if they have to