History of the Atom

Question 1

Democritus

Answer 1

all matter is small particles can’t be divided - STARTED NAME ATOM

Question 2

Dalton

Answer 2

all matter is made up of individual particles called atoms can’t be divided -WORKED WITH GASES

Question 3

Thomson

Answer 3

used sealed tube - found atoms are made of even smaller particles

Question 4

Rutherford

Answer 4

all atoms positive charge is in nucleus _ gold foil experiment

Question 5

Bohr Model

Answer 5

electrons move in orbits at fixed distance form nuclues

focused on electron arrangment

Question 6

Schrodinger

Answer 6

electron cloud model

Question 7

proton

Answer 7

positive charged particle found in nucleus

Question 8

electron

Answer 8

negative charge particle outside nucleus

Question 9

neutron

Answer 9

neutral particle in the nucleus of atom

Question 10

atomic number

Answer 10

is the number of protons in an atom of the element

atomic number = protons

Question 11

mass number

Answer 11

sum of protons and neutrons

mass number = protons + neutrons

Question 12

isotopes

Answer 12

have some atomic number but a different mass number because the neutrons are different

Question 13

electron cloud

Answer 13

gives location of electrons around nucleus

Question 14

electron cloud

Answer 14

how electrons behave in prbital

Question 15

electron configuration

Answer 15

arrangement of electrons in orbital