Chemistry Atomic structure unit 4

Question 1

First person to suggest the existence of atoms

Answer 1

Democritus a Greek philosopher

Question 2

Democritus thought that atoms were

Answer 2

invisible and indestructible

Question 3

Democritus did not get credit for his work because

Answer 3

he did not prove his theory with the scientific method

Question 4

First person to discover atoms with science

Answer 4

John Dalton

Question 5

Dalton studied the

Answer 5

ratios which elements combine in chemical reactions

Question 6

Dalton’s atomic theory stated :

Answer 6

1. elements are made of atoms
2. atoms of the same elements are identical
3. Atoms of different elements can physically mix together
4. Chemical reactions happen when elements are separated from each other.

Question 7

Atoms can be observed with

Answer 7

Scanning electro molecules

Question 8

Who discovered the electron

Answer 8

J.J Thomson

Question 9

he studied atoms with a

Answer 9

Cathode radetube

Question 10

During J.J Thomson experiments he hypothesized that

Answer 10

the electro ray was being deflected by magnets

Question 11

Original name for Electrons

Answer 11

Corpuscles

Question 12

Thomson concluded that

Answer 12

electrons are identical
all have the same ratios
electrons are in all elements

Question 13

Thomson did test on

Answer 13

compounds ratios

Question 14

Who found the quantity of an eelectrons charge

Answer 14

Robert A. Millikan

Question 15

Charge of an electron

Answer 15

-19
1.60x10

Question 16

Electrons have

Answer 16

very tiny masses

Question 17

What will remain after a negatively charged particle is removed from a neutral atom

Answer 17

there must be an electron

Question 18

Who discovered protons

Answer 18

Eugen Goldstein

Question 19

Eugen Goldstein hypothesized protons existence because

Answer 19

electrons were negatively charged

Question 20

Who discovered the neutron

Answer 20

James Chadwick

Question 21

neutron has a mass almost equal to a

Answer 21

proton

Question 22

quarks are

Answer 22

what subatomic particles are made of

Question 23

dalton thought an atom was a

Answer 23

solid sphere

Question 24

rutherford thought an atom was

Answer 24

mostly empty space with a tiny nucleus inside

Question 25

Thomsons thought an atom looked like

Answer 25

solid sphere with a + charge with electrons floating on top

Question 26

mass number is

Answer 26

the amount of protons/ electrons

Question 27

the mass number is where on the atomic symbol and is what

Answer 27

top left which is the number of protons and neutrons

Question 28

the atomic number is where and is what

Answer 28

amount of protons on the bottom left

Question 29

how can isotopes be different but chemically alike?

Answer 29

they have the same amount of protons and electrons

Question 30

what is an isotope

Answer 30

atoms are the same element and same amount of protons but different amount of nutrons.

Question 31

since isotopes of elements have different numbers of _____
, they also have different_______

Answer 31

neutrons, mass numbers

Question 32

ions are

Answer 32

atoms with charge

Question 33

atomic mass unit is equivalent to

Answer 33

one- twelfth of the mass of a carbon- 12 atom

Question 34

what is the equipment that was used to test electrons called

Answer 34

cathode ray tube