Atomic Structure

Question 1

What did Democritus believe about atoms

Answer 1

believed that all matter consisted. Of extremely small particles that couldn’t be divided

Question 2

What did Democritus call the small particles he discovered? Came from the Greek word atomos

Answer 2

Atoms

Question 3

What is Daltons atomic theory

Answer 3

All elements. Are made of atoms,all atoms of the same element have the same mass and atoms of different elements have different masses

Question 4

When did Democritus discover his theory

Answer 4

400 BC

Question 5

Wen did dalton discover his theory

Answer 5

1800’s

Question 6

What was Thompson’s revised theory of the atom

Answer 6

All atoms have neither a positive or negative charge there must always be some positive charge in the atom.

Question 7

What was Thompson’s model of the atom

Answer 7

An atom that is filled with a positively charged mass of matter that has negative charges evenly scattered throughout it.

Question 8

Rutherford atomic theory

Answer 8

Positive charge is concentated in a small central area, the nucleus, it is positively charged located in the center of an atom

Question 9

when did Thomson come up with his model of the atom

Answer 9

1897

Question 10

When did Rutherford come up with his theory?

Answer 10

1911

Question 11

_____ concluded that the amount of positive charge varies among elements

Answer 11

Rutherford

Question 12

Each nucleus must contain at LEAST ___ proton

Answer 12

uno

Question 13

who detected electrons or negatively charged particles

Answer 13

Thomson

Question 14

who carried ou the experiment to show that neutrons exist and when

Answer 14

James Chadwick
In 1932

Question 15

A neutron has a mass equal to a ___

Answer 15

Proton

Question 16

Where is a proton located,what’s its charge, symbol,mass, and who discovered it

Answer 16

Located- nucleus
Charge-positive
Symbol- P
Scientist- Rutherford 1911
Mass- 1 AMU

Question 17

where is a electron located,what’s its charge, symbol,mass, and who discovered it

Answer 17

Located- cloud
Charge- negative
Symbol- -e
Scientist - Thompson 1897
Mass- 1/1836

Question 18

where is a neutron located,what’s its charge, symbol,mass, and who discovered it and when

Answer 18

Located- nucleus
Charge- 0 (neural)
Symbol-N
Scientist- James Chadwick 1932
Mass- 1 AMU

Question 19

Everything scientists know about atoms is based on how the

Answer 19

Particles behave in experiments

Question 20

protons and neutrons have _____ mass

Answer 20

Almost the same mass

Question 21

About___ electrons = the mass of one proton

Answer 21

2000

Question 22

____ are found in the cloud

Answer 22

Electrons

Question 23

____ & _____ are found in the nucleus

Answer 23

Protons and neutrond

Question 24

the atomic number of an element is the number of _____ in an atom

Answer 24

Protons

Question 25

Each element has a ____ atomic number

Answer 25

different

Question 26

Atoms are..

Answer 26

Neutral

Question 27

each positive charge in an atom is ______ by a _______ charge

Answer 27

Balanced, Negative

Question 28

Atomic NUmber

Answer 28

Equals the number of electrons and protons in an atom of that element

Question 29

If sulfur has an atomic number of 100 then how many electrons does it have

Answer 29

100

Question 30

Mass NUmber of an atom

Answer 30

Is the sum of the protons and neutrons in the nucleus of that atom

Question 31

Mass number of an atom minus the atomic number =

Answer 31

Number of neutrons

Question 32

Isotopes

Answer 32

Atoms of the same element that have different numbers of neutrons and different mass numbers

Question 33

To distinguish one isotope from another the isotopes are refers by their ___

Answer 33

Mass

Question 34

Bohrs Model

Answer 34

Electrons move with constant speed in fixed orbits around the nucleus and each electron has a specific amount of energy

Question 35

when an atom Gaines or loses energy the energy of an _____ can change

Answer 35

Electron

Question 36

When was bohrs model discovered

Answer 36

1913

Question 37

Possible energies that electrons in an atom can have are called

Answer 37

Energy levels

Question 38

an ___ can change _______ ______ when the atom Gaines or loses ___

Answer 38

Electron; energy levels; energy

Question 39

No two elements have the same electron of ______ ___

Answer 39

energy levels

Question 40

The movement between changing ____ _____ explains the light you see during fireworks.

Answer 40

energy levels

Question 41

heat causes electrons to move to ___ energy levels

Answer 41

Higher

Question 42

When electrons move to _____ energy levels they ____ energy.

Answer 42

Lower; release

Question 43

Bohr ____ assigned energy levels to electrons, but ___ about saying the electrons moving like planets

Answer 43

Correctly; incorrect

Question 44

scientists use ___ to determine the location and motions of ____ in atoms

Answer 44

Probability; electrons

Question 45

Electron Cloud model

Answer 45

Model that most likely shows locations for electrons in an atom and says that they move around more free

Question 46

Orbital

Answer 46

A region of space around the nucleus where an electron is likely to be found; its path

Question 47

The ____ ______ represents all the orbitals in an atom

Answer 47

Electron cloud

Question 48

How many electrons can the first layer of an atom hold

Answer 48

2

Question 49

How many electrons can the second layer of an atom hold

Answer 49

8

Question 50

How many electrons can the third layer of an atom hold

Answer 50

18

Question 51

How many electrons can the fourth layer of an atom hold

Answer 51

32

Question 52

_____ revised daltons model to account for ____ particles

Answer 52

Thomson; subatomic

Question 53

rutherford added onto ___ model since id didn’t explain all the evidence

Answer 53

Thomson