WorksheetsHistory of Atoms
Total questions: 25
Worksheet time: 25mins
Who proposed that matter was formed of small indivisible particles?
Dalton
Thomson
Democritus
Chadwick
What contribution did John Dalton make to atomic theory?
He discovered that every atom was positively charged.
He discovered that every element consisted of one type of atom.
He discovered that atoms had nuclei.
He discovered that atoms could be divided into smaller parts.
Place the following scientists in order, from earliest to latest:
Ernest Rutherford
J.J. Thomson
John Dalton
C,A,B
A,C,B
C,B,A
B,C,A
Who developed the solid-sphere model of the atom?
JJ Thomson
Ernest Rutherford
Neils Bohr
John Dalton
The history of the Atomic Theory involves many changes from its early form. Theories change because
people decide to no longer agree with them.
all theories must be changed after a certain time.
new evidence is found that allows the theory to be changed.
when scientists die, their theories are always changed.
The Cathode Ray Tube experiment led to this model that was developed by ___.
JJ Thomson
John Dalton
Ernest Rutherford
Democritus
Place the following atomic models in order, from earliest to latest:
B, C, A
C, A, B
A, C, B
C, B, A
What contribution did John Dalton make to atomic theory?
He discovered that every atom was positively charged.
He discovered that every element consisted of one type of atom
He discovered that atoms had nuclei
He discovered that atoms could be divided into smaller parts
Who proposed the plum pudding model of the atom?
Niels Bohr
J.J. Thomson
Ernest Rutherford
John Dalton
Which experiment led to the discovery of the nucleus?
Gold foil experiment
Cathode ray experiment
Oil drop experiment
Photoelectric effect
What did John Dalton contribute to atomic theory?
Law of definite proportions
Plum pudding model
Quantum theory
Atomic theory with indivisible atoms
Which scientist is known for the planetary model of the atom?
Niels Bohr
Albert Einstein
J.J. Thomson
Ernest Rutherford
What is the main idea of the Bohr model of the atom?
Electrons orbit the nucleus in fixed paths
Atoms are indivisible
Atoms are mostly empty space
Electrons are embedded in a positive sphere
Which atomic model first introduced the concept of quantized energy levels?
Bohr model
Rutherford model
Thomson model
Dalton model
What did the gold foil experiment demonstrate about the structure of the atom?
Atoms have a dense nucleus
Atoms are indivisible
Electrons are in fixed orbits
Atoms are mostly empty space
Who is credited with the discovery of the electron?
J.J. Thomson
Ernest Rutherford
Niels Bohr
James Chadwick
Which model of the atom was the first to include a nucleus?
Rutherford model
Bohr model
Thomson model
Dalton model
What was the major flaw in the Rutherford model of the atom?
It couldn't explain electron stability
It didn't include a nucleus
It suggested electrons were stationary
It didn't account for atomic mass
Which scientist discovered the neutron?
James Chadwick
Niels Bohr
J.J. Thomson
Ernest Rutherford
What is the significance of the cathode ray experiment?
Discovery of the electron
Discovery of the neutron
Discovery of the proton
Discovery of the nucleus
Which atomic model is described as electrons embedded in a positive sphere?
Thomson model
Bohr model
Rutherford model
Dalton model
What did Niels Bohr's model of the atom fail to explain?
Spectra of larger atoms
Existence of the nucleus
Presence of electrons
Atomic mass
Which model of the atom is based on quantum mechanics?
Quantum mechanical model
Bohr model
Rutherford model
Thomson model
What is the main feature of the quantum mechanical model of the atom?
Probability clouds for electron positions
Fixed orbits for electrons
Electrons embedded in a positive sphere
Indivisible atoms
Who first proposed that atoms are indivisible particles?
John Dalton
Niels Bohr
J.J. Thomson
Ernest Rutherford
