Chapter 3 Lecture Notes and Test Notes

Question 0

The bottom left number on an element,
Example: Beryllium has a bottom left number of 4, this number signifies waht?

 Be
4

Answer 0

The its’ atomic number is 4

Question 1

Atoms contain equal numbers of protons and electrons (assuming the atom is neutral)

Answer 1

Protons and neutrons

Question 2

the upper left number on an atomic symbol signifies what?
Example: Lithium has an upper left number of 6 what does this mean?

  6
    L

Answer 2

Its atomic mass is 6

Question 3

the higher electrons are in the orbitals then the ………

Answer 3

More energy they have

Question 4

smaller particles that make up atoms are called

Answer 4

subatomic particles

Question 5

What did Thomson’s cathode- ray tube experiment show?

Answer 5

that the cathode ray was full of negatively charged particles

that the particles had mass and were real

he was seeing electrons

Question 6

was Thomson’s model of an atom correct (Plum pudding model)

Answer 6

no

Question 7

What did Rutherford’s gold foil experiment show?

Answer 7

that a concentrated positive charge existed somewhere within the atom

Question 8

what are positively charged molecules

Answer 8

Protons

Question 9

what are neutrally charged particles

Answer 9

neutrons

Question 10

What make up the nucleus

Answer 10

Protons and neutrons

Question 11

What states that the closer two charges are the greater the force between them

Answer 11

Columb’s Law

Question 12

number of the protons and electron in an atom is shown by the

Answer 12

Atomic number

Question 13

The mass number tells you the total (sum of) the…..

Answer 13

Protons and neutrons

Question 14

in isotopes the mass number can also be written as

Answer 14

element-5

example: helium-4

Question 15

atoms of the same element that have different numbers of neutrons are called

Answer 15

isotopes

Question 16

What did Rutherford’s model show

Answer 16

it showed electrons orbiting the nucleus like planets orbit the sun

Question 17

what did Bohr’s model show

Answer 17

it showed electrons that can only be a certain distance away from the nucleus, and each distance corresponds with a quantity of energy an electron has

Question 18

electrons have both ____ and _____ properties

Answer 18

particle and wave properties

Question 19

describe the present day model of an atom

Answer 19

the nucleus is surrounded by a kind of electron cloud that do not have sharp boundaries..

Question 20

the _______ is the distance between two consecutive peaks of a wave

Answer 20

Wavelength

Question 21

the _______ of a wave is how many peaks there are in a given section of a wave

Answer 21

frequency

Question 22

So as the frequency gets higher the wavelengths get ______

Answer 22

Shorter

Question 23

an electron at its lowest possible energy state is at

Answer 23

Ground state

Question 24

if an electron gains energy it moves to an

Answer 24

excited state

Question 25

an electron in an _____ state will release a specific quantity of energy (Light, fire, heat, gas) as it "falls" back to its ____ state

Answer 25

excited state back to its ground state

Question 26

the present day model of an atom is also known as the

Answer 26

Quantum model

Question 27

List the four quantum numbers that specify the properties of the electron's

Answer 27

Principal quantum number symbolized by n Angular momentum quantum number symbolized by l magnetic quantum number symbolized by m spin quantum number symbolized by + or -

Question 28

REVIEW MATH AND FORMULAS ON IN 3.4

Answer 28

DO IT

Question 29

REVIEW HOW LIST AN ELEMENT IN AAUFFBAU HOTEL FORM AND REGULAR FORM

Answer 29

LAST PAGE OF LECTURE NOTES ON 3.3