Atomic

Question 1

Coined the word atom

Answer 1

Democritus

Question 2

Proposed the Atomic theory

Answer 2

John Dalton

Question 3

1. Elements are composed of tiny indivisible particles called atoms
2. Atoms of different elements are chemically different; however atoms of a given element are of the same size, shape, mass and chemical properties

Answer 3

Atomic Theory

Question 4

Proposed the “Law of Conservation of Mass”

Answer 4

Antoine Lavoiser

Question 5

“A chemical reaction only involves separation, combination or rearragement of atoms”

Answer 5

Law of Conservation of Mass

Question 6

Proposed the “Law of Multiple Proportions”

Answer 6

John Dalton

Question 7

“When two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combines with the fixed mass of the other are simple whole number ratios”

Answer 7

Law of Multiple Proportions

Question 8

Proposed the “Law of Definite Proportions”

Answer 8

Joseph Proust

Question 9

“A given chemical compound always contains the same elements in the exact same proportions by mass”

Answer 9

Law of Definite Proportions

Question 10

Discovered the negatively-charged particles, electrons

Answer 10

Joseph John Thompson

Question 11

Used to determine the electrons

Answer 11

Cathode Ray Tube

Question 12

Suggested the Plum-Pudding Model

Answer 12

Joseph John Thompson

Question 13

Determined the ratio of the electric charge to the mass of an electron to be -1.76x10¹¹ C/kg

Answer 13

Joseph John Thompson

Question 14

Gave the name electron

Answer 14

George Johnstone Stoney

Question 15

Determined the mass of an electron

Answer 15

Robert Millikan

Question 16

Used to determine the mass of an electron

Answer 16

Oil drop experiment

Question 17

Discovered the positively-charged particles, protons

Answer 17

Eugene Goldstein

Question 18

Used to determine the protons

Answer 18

Anode Ray Tube

Question 19

Discovered neutron by bombarding Be with alpha particles. These particles are not affected by electric field

Answer 19

James Chadwick

Question 20

Discovered nucleus by performing Goild foil experiment wherein a thin foil of gold is bombarded with alpha particles

Answer 20

Ernest Rutherford

Question 21

Is a phenomenon where electrons are emitted from the metal surface when the light of sufficient frequency is incident upon

Answer 21

Photoelectric effect

Question 22

Basis for solar panels

Answer 22

Photoelectric effect

Question 23

Is the minimum energy required to remove an electeon from the surface of the material

Answer 23

Work function

Question 24

1 eV = ___ J

Answer 24

1.6x10‐¹⁹ J

Question 25

1 kWh = ____ MJ

Answer 25

3.6

Question 26

Scattering of a photon by a charged particle, usually an electron

Answer 26

Compton Scattering

Question 27

Matter might also exhibit wave-like properties under suitable conditions

Answer 27

De Broglie Wavelength

Question 28

It states that "Any hot vibrating body does not emit nor absorb energy continuously, but discontinuously, in the form of small packets of quanta"

Answer 28

The Quantum Theory of Atoms

Question 29

It states that " It is impossible to know exactly both the position and momentum of an electron or any other small particle simultaneously and accurately"

Answer 29

Heisenberg Uncertainty Principle

Question 30

It states that "Electrons behave as particles and waves"

Answer 30

Wave - particle duality

Question 31

It states that "Electrons revolved around the nucleus in elliptical orbits with different eccentricities of which Bohr's circular is a special case"

Answer 31

Bohr -Sommerfield Theory

Question 32

Concluded that electrons behave more like waves than particles

Answer 32

Davisson - Germer Experiment

Question 33

The region in space around the nucleus where it is most probable to find an electron

Answer 33

Orbital

Question 34

Tells the 1. Distance of an electron from the nucleus 2. Energy of an electron in the orbit (energy levels)

Answer 34

Principal Quantum Number

Question 35

True or False The larger the value ofthe principal quantum number, the farther is the electron from the nucleus

Answer 35

TRUE

Question 36

Tells the 1. Shape of orbital 2. Subshell position of electron

Answer 36

Azimuthal / Angular Quantum Numbers

Question 37

Tells about 1. Orientation of orbitals in space

Answer 37

Magnetic Quantum Number

Question 38

Shows the spin of electrons

Answer 38

Spin Quantum Number

Question 39

Aufbau means

Answer 39

Filling up

Question 40

States that "the orbitals must be filled up in increasing energy levels"

Answer 40

Aufbau Principle

Question 41

States that "No two electrons in an atom can have the same set of quantum numbers and an atomic orbital must contain a maximum of two electrons with opposite spins"

Answer 41

Pauli's Exclusion Principle

Question 42

States that 1. The pairing up of electrons in an orbital of a subshell takes place only when all orbitals contain atleast on electron 2. The most stable arrangement of electrons in subshells is the one with more parallel spins

Answer 42

Hund's Rule of Maximum Multiplicity

Question 43

States that "The stablest structure is the one with carbon atom that has formal charge near to zero"

Answer 43

Kekule Rule of Resonance

Question 44

The hydrogen emission lines associated with the visible part of the spectrum is called the ____ series

Answer 44

Balmer

Question 45

The hydrogen emission lines associated with the ultraviolet part of the spectrum is called the

Answer 45

Lyman

Question 46

The hydrogen emission lines associated with the infrared part of the spectrum is called the _____ series

Answer 46

Paschen