Question

atomic models worksheet
use your notes and the internet to help you fill in the following outline of the history of the atom. every empty square needs to be filled in.
year,scientist,contribution,diagram
,john dalton,atom is indestructible with no internal structure,
1897
1904,hantaro nagaoka
,finds than an atom has a small, dense, positive nucleus and electrons are in the empty space,
1913,electron moves in circular orbit at fixed distances from the nucleus
,louis de broglie,proposes that electrons have some properties of waves
,erwin schrodinger
,james chadwick

Explanation:

1897: J. J. Thomson discovered the electron and proposed the plum - pudding model where electrons are embedded in a positively charged sphere.
1904: Hantaro Nagaoka proposed a planetary - like model with a central nucleus and electrons orbiting around it.
1911: Ernest Rutherford conducted the gold - foil experiment and found an atom has a small, dense, positive nucleus and electrons are in the empty space.
1913: Niels Bohr proposed that electrons move in circular orbits at fixed distances from the nucleus.
Louis de Broglie made his proposal around 1924.
Erwin Schrödinger developed wave - mechanical model of the atom in 1926, describing the probability of finding an electron in a certain region.
James Chadwick discovered the neutron in 1932.

Answer:

Year	Scientist	Contribution	Diagram
1904	Hantaro Nagaoka	Proposed planetary - like model with central nucleus and orbiting electrons	[Nagaoka's model diagram]
1911	Ernest Rutherford	Found atom has small, dense, positive nucleus and electrons in empty space (from gold - foil experiment)	[Rutherford's model diagram]
1913	Niels Bohr	Electron moves in circular orbit at fixed distances from the nucleus	[Bohr's model diagram]
1924	Louis de Broglie	Proposes that electrons have some properties of waves	No specific diagram given in the question
1926	Erwin Schrödinger	Developed wave - mechanical model of the atom, probability of electron location	[Schrödinger's model diagram]
1932	James Chadwick	Discovered the neutron	No specific diagram given in the question