The Atom

Question 1

The indivisible particles Leucippus and Democritus said would be the result of dividing matter again and again

Answer 1

atoms

Question 2

The model John Dalton adopted (also by Leucippus and Democritus)

Answer 2

spherical model

Question 3

Who made the plum pudding model and said that atoms are actually divisible (with electrons in a sea of positive charge)?

Answer 3

JJ Thomson

Question 4

Who did the alpha scattering experiment on thin gold foil (showing positive alpha particles passed through most of the atom)?

Answer 4

Ernest Rutherford

Question 5

The atom is mostly open/closed space

Answer 5

Open

Question 6

Atoms of different elements have ____ positive charges

Answer 6

different

Question 7

Who discovered protons?

Answer 7

Eugen Goldstein

Question 8

Who discovered neutrons?

Answer 8

James Chadwick

Question 9

Who developed the Planetary model (showing electrons orbiting in specific energy levels)?

Answer 9

Niels Bohr

Question 10

What model did Ernest Rutherford develop?

Answer 10

Nuclear Model

Question 11

Who said particles such as electrons exhibit wave like behavior?

Answer 11

Louie de Broglie

Question 12

Who revised Bohr’s model?

Answer 12

Erwin Schrödinger

Question 13

What did Werner Heisenberg say about modeling electrons?

Answer 13

It is mathematically impossible to know the position and momentum of an electron at a specific time

Question 14

The region electrons are most likely to be found

Answer 14

atomic orbitals

Question 15

What is in John Dalton’s theory?

Answer 15

1. Elements are composed of small particles called atoms
2. Law of Conservation of Mass (total mass of reactants = total mass of products)
3. Law of Definite Proportion or Composition
4. Law of Multiple Proportions

Question 16

What does the law of definite proportion mean?

Answer 16

H2O = 1 hydrogen for every 2 oxygen and vice versa

Question 17

What does the law of Multiple proportions mean?

Answer 17

atoms can combine or separate to make variations of a product in different proportions (carbon and oxygen can make CO2 or CO)

Question 18

What are the nucleons (found in nucleus)?

Answer 18

protons and neutrons

Question 19

Who discovered the photoelectric effect?

Answer 19

Heinrich Hertz

Question 20

What did Albert Einstein theorize for light?

Answer 20

Existence of packets of light now called photons

Question 21

Who proposed that the momentum (frequency) is inversely proportional to the wavelength?

Answer 21

Louie de Broglie

Question 22

What does the principal quantum number represent?

Answer 22

shell or energy level

Question 23

What does the Azimuthal quantum number represent?

Answer 23

electron subshell

Question 24

What does the magnetic quantum number represent?

Answer 24

orbital

Question 25

What does the spin magnetic quantum number represent?

Answer 25

magnetic spin

Question 26

No two electrons can have the same set of quantum numbers

Answer 26

Pauli’s Exclusion Principle

Question 27

Electrons occupy singly before pairing up

Answer 27

Hund’s Rule of Maximum Multiplicity

Question 28

Electrons occupy the lowest available energy levels before filling higher levels

Answer 28

Aufbau Principle

Question 29

Who devised the Modern Periodic Table of Elements?

Answer 29

Dmitri Mendeleev

Question 30

Materials that have properties in between metals and non metals

Answer 30

Metalloids

Question 31

what is electronegativity?

Answer 31

ability to attract an electron

Question 32

what is ionization energy?

Answer 32

energy needed to remove an electron

Question 33

what is electron affinity?

Answer 33

energy released when a gaseous atom gains an electron

Question 34

what are ions?

Answer 34

atoms that have lost or gained electrons (changing its charge)

Question 35

positively atoms are smaller than neutral atoms, true or false?

Answer 35

true

Question 36

why are anions larger than the neutral atom?

Answer 36

because there are more electrons in the cloud