atomic structure

Question 1

atomic theory

Answer 1

theory that all matter is composed of atoms

Question 2

basic unit of matter

Answer 2

atom

Question 3

pure substance composed of one type of atom

Answer 3

element

Question 4

pure susbtance composed of atoms of two or more elelments that are chemically combined

Answer 4

compound

Question 5

compounds always has the same composition by mass (percent)

Answer 5

law of definite proportions

Question 6

mass is never created or detroyed

Answer 6

law of conservation of mass

Question 7

mass ratio of elements that are chemically combined can be expressed as whole numbers

Answer 7

law of multiple proportions

Question 8

whos theory says that matter consists of indivisible particles called atoms and that atoms of a given element are all identical and can neither be created nor destroyed

Answer 8

dalton

Question 9

what was dalton wrong about

Answer 9

atoms are divisible and they are made of subatomic particles

Question 10

who discovered atoms consiting of subatomic particles and the electron

Answer 10

jj thompson- by studying the flow of electricty

Question 11

who discovered electrons

Answer 11

jj thompson

Question 12

what are atoms charged as

Answer 12

neutral

Question 13

who did the gold foil experiment and discoverd the atoms nucleus

Answer 13

rutherford

Question 14

who discoverd the neutron

Answer 14

chadwick

Question 15

what does atomic nnumber show

Answer 15

(top left)- protons & electrons

Question 16

where is atomic mass

Answer 16

bottom decimal number

Question 17

how to find mas number

Answer 17

rounded atomic mass/ p+n

Question 18

iin carbon-12, what is the mass number

Answer 18

12

Question 19

how is nuclear notation written

Answer 19

mass number on top, atomic number on bottom, element symbol

Question 20

how to find number of neutrons

Answer 20

mass number-atomic number

Question 21

what are isotopes

Answer 21

atoms with the same element, but differnt mass number (differnt top nummber in nuclear notation)

Question 22

how do u know if an isotope is radioactive

Answer 22

if the atomic number is more than 83

Question 23

what are cations

Answer 23

positively charged ions that have lost one or more electrons

Question 24

where does a cations charge come from

Answer 24

how many electrons are being added

Question 25

what are anions

Answer 25

negatively charged ions which have gained 1 or more electrons

Question 26

where does a anions charge come from

Answer 26

how many electrons being taken away

Question 27

what number in the atom changes with isotopes

Answer 27

neutrons

Question 28

what do letters represent

Answer 28

symbol

Question 29

how to find mass number from atomic number and neutrons

Answer 29

add them

Question 30

what do u do when given both isotope info

Answer 30

put percent behind decimal and calculate normal

Question 31

what if only 1 istope is given

Answer 31

subtract the percent from 100, and then put the answer behind the decimal point