History Of The Atom

Question 1

Democritus

Answer 1

First to name the atom

Question 2

John Daltons

Answer 2

Thought that atom is a solid sphere and can’t get any smaller

Question 3

Mendeleev

Answer 3

Developed the first periodic table organized by atomic mass

Question 4

JJ Thomson plum pudding model

Answer 4

The atom is divisible

Question 5

Rutherford nuclear model

Answer 5

Gold foil experiment- the mass of atom and its positively charged particles were in the nucleus with low mass negatively charged particles surrounding it

Question 6

Moseley

Answer 6

Discovered the number of protons is unique to each element and arranged the periodic table this way. Atomic number

Question 7

Bohr model

Answer 7

Electrons are negative particles that travel in fixed orbits around the positively charged nucleus that is made of positive protons and neutral neutrons

Question 8

Schrodinger and Heisenberg model

Answer 8

Nucleus is surrounded by an cloud of electrons that is divided into shells