Science(atoms)

Question 1

basic unit of matter

Answer 1

atoms

Question 2

positevely charged sub atomic particle

Answer 2

proton

Question 3

uncharged subatomic particle

Answer 3

neutrons

Question 4

negatively charged subatomic particles

Answer 4

electrons

Question 5

total number of protons in an atom

Answer 5

atomic number

Question 6

total number of protons and neutrons in the atom

Answer 6

mass number

Question 7

atom of the same element and number but can have different mass

Answer 7

isotopes

Question 8

proposed the atomic theory in 1803

Answer 8

john dalton

Question 9

name atleast 2 of daltons postulates

Answer 9

1. elements are made of discrete atoms
2. atoms of same elements are identical atoms of diff elements
3. compounds are composed of more than 1 element

Question 10

conducted experiments in 1879 with a gas discharged tube and generated an ivisibke negatively cahreged rays that made the end glow

Answer 10

william crooke

Question 11

discovered electrons in a sphere and create d the plum pudding model in 1897

Answer 11

jj thomson

Question 12

performed oil drum expreriment in 1909 and determined the mass and charge of an electron

Answer 12

robert milikan

Question 13

1886 discovered positive rays using a perforated cathode ray tube

Answer 13

eugen goldstein

Question 14

identified protons through gold foil experiement

Answer 14

enerst rutherford,hans geiger,enerst marsden

Question 15

discovered uncharged particles in a nucleus in 1932

Answer 15

james chadwick

Question 16

name the parts

AN
z

MN

Answer 16

atomic number
element
mass number

Question 17

equal to protons and electrons

Answer 17

atomic neumber

Question 18

equal to the sum of protons and neutrons

Answer 18

mass number

Question 19

identitfy of an element

Answer 19

atomic number

Question 20

formula for neutrons

Answer 20

mass number-atomic number