atomic structure

Question 1

name 3 atomic particles

Answer 1

1. proton
2. neutron
3. electrons

Question 2

who discovered the electron

Answer 2

thomson

Question 3

what did thomson say

Answer 3

plum pudding model: the negatively charged electrons were embeded in a sphere of positive charge

Question 4

who discovered the proton

Answer 4

rutherford

Question 5

what did rutherford said

Answer 5

suggested electrons orbit a positively chrged nuc;leus. he called the positive charges protons

Question 6

what did chadwick discover

Answer 6

the neutron

Question 7

what did chadwick say

Answer 7

much later chadwick discovered neutrons. the neutron was more difficult to detect as it is neutral

Question 8

radius of nucleus

Answer 8

less tham 1/10000th of that of the atom (less than 1x 10-14m)

Question 9

radius of atom

Answer 9

about 0.1nm (1*10-10m)

Question 10

atomic number

Answer 10

number of protons in an atom

Question 11

mass number

Answer 11

number of protons and neutrons in an atom

Question 12

why are atoms neutral

Answer 12

the number of protons equals the number of electrons

Question 13

mass of the proton

Answer 13

1

Question 14

mass of neutron

Answer 14

1

Question 15

mass of elctron

Answer 15

1/1840

Question 16

charge of proton

Answer 16

+1

Question 17

charge of neutron

Answer 17

0

Question 18

charge of electron

Answer 18

-1

Question 19

position of proton

Answer 19

nucleus

Question 20

position of neutron

Answer 20

nucleus

Question 21

position of electrons

Answer 21

shells

Question 22

definition of isotopes

Answer 22

atoms of the same element with the same number of protons but different number of neutrons

Question 23

isotopes only differ in the number of ____________

Answer 23

neutrons

Question 24

relative atomic mass

Answer 24

the average mass of rhe isotopes

Question 25

what is the mass of all isotopes compared to

Answer 25

carbon 12

Question 26

ions

Answer 26

charged atoms

Question 27

the atoms become ions by _____________________

Answer 27

gaining or losing electrons

Question 28

a positive ion is called a

Answer 28

cation

Question 29

a negative is called a

Answer 29

anion

Question 30

definition of a compound

Answer 30

2 or more elements chemically combined