test 2

Question 1

gold foil experiment

Answer 1

nucleus is small and dense and its mostly empty space. Alpha particles were shot at gold foil and some went through while others bounced back

Question 2

solar system model

Answer 2

electrons orbit the nucleus at constant speeds causing them to implode,

Question 3

electron cloud model

Answer 3

electrons travel randomly and occupy energy levels based on the 90% probability of finding an electron in empty space called quantum mechanical model

Question 4

wave-particle duality of motion

Answer 4

electrons act like both waves and particles

Question 5

electromagnetc radiation

Answer 5

energy lost or gained when electrons move energy levels

Question 6

Electromagnetic spectrum

Answer 6

Consists of radiation over a broad range of wavelengths

Question 7

amplitude

Answer 7

the height of the wave from origin to crest

Question 8

wavelength

Answer 8

the distance between wave crests units in cm

Question 9

frequency

Answer 9

number of wave cycles to pass a given point per unit of time. units are v or Hz

Question 10

inversely proportional

Answer 10

when one goes up the other goes down

Question 11

speed of light in a vaccum

Answer 11

3.00x10^8 m/sec formula is c=wavelengthv

Question 12

photoelectric effect

Answer 12

electrons are ejected by metals when light shines on them, lightwaves act like particles. the energy of the light has be at a certain minimum energy

Question 13

quantum concept

Answer 13

energy increases in small discrete units called quanta

Question 14

photon

Answer 14

discrete units of light energy

Question 15

frequency 2

Answer 15

energy per photon

Question 16

intensity

Answer 16

number of photons

Question 17

planks constant

Answer 17

h=6.626x10⁻34J*sec

Question 18

Formula to find energy

Answer 18

E=hv

Question 19

Atomic Emission Spectra

Answer 19

every element emits a unique atomic spectrum the pattern of frequencies obtained by passing energy emitted by atoms of an element in the gas phase through a prism

Question 20

ground state

Answer 20

the lowest energy level

Question 21

excited state

Answer 21

highest energy level an electron can be

Question 22

valance electron

Answer 22

in the outermost shell they determine how an atom will react

Question 23

octet rule

Answer 23

atoms having 8 electrons in the valance shell it determines the physical and chemical properties

Question 24

protons and electrons same as

Answer 24

atomic number

Question 25

cations

Answer 25

metals that lose electrons to become positive

Question 26

anions

Answer 26

nonmetals that gain electrons and become negative

Question 27

atoms are

Answer 27

neutral & unstable

Question 28

ions are

Answer 28

charged & stable

Question 29

protons determine what

Answer 29

which element it is, its an identifier

Question 30

decimals on the PT?

Answer 30

Weighted average mass of all the isotopes

Question 31

shortest to longest

Answer 31

violet, indigo, blue, green, yellow,orange, red

Question 32

evidence for particle theory of electron

Answer 32

planks quantum model and the photoelectric effect

Question 33

whys the sky blue?

Answer 33

Blue light has a shorter wavelength so it travels faster and spreads farther and the white light passes through the atmosphere and air molecules cause it to scatter

Question 34

crest

Answer 34

top of wave

Question 35

trough

Answer 35

botttom of wave

Question 36

mid point

Answer 36

middle of a wave