Atoms

Question 1

Greek philosopher through whom the earliest version of atomic theory was conceived

Answer 1

Democritus

Question 2

smaller, indivisible particles

from Democritus

Answer 2

Atomos

Question 3

English chemist and physicist who developed the atomic theory of matter

Answer 3

John Dalton

Question 4

atoms can neither be created nor destroyed; they can only change in how they are bound together

John Dalton

Answer 4

Law of Conservation of Mass

Question 5

even smaller particles that make up atoms

Answer 5

Subatomic Particles

Question 6

English physicist who found the charge-to-mass ratio of an electron

Answer 6

Joseph John Thomson

Question 7

American physicist who found the charge and mass of an electron

Answer 7

Robert Andrews Millikan

Question 8

the atom is a uniform, positive sphere w/ electrons embedded in it

Joseph John Thomson

Answer 8

Plum Pudding Model

Question 9

atoms are mostly empty space; its positive charges (protons) are attached to a core (nucleus)

Ernest Rutherford

Answer 9

Gold Foil Experiment

Question 10

mass of a proton (g)

Answer 10

1.67262 x 10^-24 g

Question 11

mass of a neutron

Answer 11

1.67493 x 10^-24 g

Question 12

mass of an electron

Answer 12

9.10938 x 10^-19 g

Question 13

charge of a proton

Answer 13

1.6022 x 10^-19 C

Question 14

charge of a neutron

Answer 14

0

Question 15

charge of an electron

Answer 15

-1.6022 x 10^-19 C

Question 16

the number of protons in the atom’s nucleus

Z

Answer 16

Atomic Number

Question 17

no. of protons + no. of neutrons

A

not written in the moder periodic table of elements

Answer 17

Mass Number

Question 18

the mass of protons and neutrons

Answer 18

Atomic Mass

Question 19

electrons revolve around a positive nucleus in a predetermined orbit

Niels Bohr

Answer 19

Planetary Model

Question 20

electrons are most probably found in a three-dimensional space (orbital) around the nucleus

Erwin Schrödinger

Answer 20

Quantum Mechanical Model

Question 21

the main energy levels (or shells) of an orbital

Answer 21

Principal Quantum Number (n)

Question 22

the energy sublevels (or subshells) of the orbital

shape of the oribtal

Answer 22

Azimuthal Quantum Number (ℓ)

also known as “angular momentum quantum number”

Question 23

shape of p (principal)

ℓ level = 1

Answer 23

Dumb-bell

Question 24

shape of s (sharp)

ℓ level = 0

Answer 24

Spherical

Question 25

shape of d (diffuse) ## Footnote ℓ level = 2

Answer 25

not easily visualized

Question 26

shape of f (fundamental) ## Footnote ℓ level = 3

Answer 26

not easily visualized

Question 27

the orientation of orbitals in space

Answer 27

Magnetic Quantum Number (mℓ)

Question 28

pertains to the electron spin

Answer 28

Spin Quantum Number (ms) ## Footnote clockwise or counterclockwise (+1/2 or -1/2)

Question 29

the distribution of electrons among the various orbitals in an atom, molecule, or ion

Answer 29

Electron Configuration