WorksheetsHW: The History of the Atom
Total questions: 20
Worksheet time: 15mins
The Greek philosopher who first spoke about the idea of an atom was:
Plato
Democritus
Aristotle
Socrates
Thomson’s experimentation with the ________________ helped lead to his discovery of the corpuscle (electron).
cathode ray tube
mass spectrometer
oil drop apparatus
gold foil
Which of the following lists correctly states Dalton’s Four Postulates that contributed to atomic theory?
All matter is made of atoms; Atoms are indivisible and indestructible; All atoms of a given element are identical; Atoms combine in simple whole-number ratios to form compounds.
Atoms are made of protons, neutrons, and electrons; Atoms can be divided; Atoms of the same element have different masses; Atoms combine in any ratio.
All matter is made of molecules; Molecules are indivisible; All molecules of a given element are identical; Molecules combine in complex ratios.
Atoms are made of energy; Atoms are always visible; Atoms of different elements are identical; Atoms do not combine.
The scientist best known for his “Plum Pudding” model of the atom is:
J.J. Thomson
Ernest Rutherford
Niels Bohr
John Dalton
The scientist who discovered the electron is:
J.J. Thomson
Isaac Newton
Albert Einstein
Niels Bohr
The scientist who discovered the nucleus is:
Ernest Rutherford
Isaac Newton
Niels Bohr
James Chadwick
The scientist who proposed the “Planetary Model” of an atom where the electrons orbit around the nucleus is:
Niels Bohr
Ernest Rutherford
J.J. Thomson
James Chadwick
The scientist who described electrons as waves that move in orbitals is:
Niels Bohr
Erwin Schrödinger
James Chadwick
J.J. Thomson
The scientist who discovered the neutron is:
James Chadwick
Ernest Rutherford
Niels Bohr
Marie Curie
Which scientist’s model described atoms as tiny, solid spheres that could not be broken down into smaller parts (could not be divided)?
John Dalton
J.J. Thomson
Ernest Rutherford
Niels Bohr
Which model was developed after the discovery of the electron? The model shows electrons floating freely in a positive space.
The Plum Pudding Model (J.J. Thomson's model)
The Bohr Model
The Quantum Mechanical Model
The Rutherford Model
Which model described the atom as having a positive center – called the nucleus – with an empty space where electrons could be found?
Rutherford's model
Thomson's model
Bohr's model
Dalton's model
Which model was developed after conducting the gold foil experiment?
Rutherford's model
Dalton's model
Bohr's model
Thomson's model
Which subatomic particle was the last to be discovered in 1932?
Neutron
Proton
Electron
Positron
Which subatomic particle – originally called a corpuscle – was the first to be discovered?
Electron
Proton
Neutron
Positron
Which model states that electrons fill lower energy levels first, before filling new energy levels?
The Bohr model
The Dalton model
The Rutherford model
The Thomson model
Which model of the atom do scientists still use today?
The Quantum Mechanical Model (Electron Cloud Model)
The Plum Pudding Model
The Bohr Model
The Dalton Model
Who is credited with developing atomic theory? He is sometimes referred to as the “father of atomic theory.”
John Dalton
Isaac Newton
Dmitri Mendeleev
Albert Einstein
Rutherford’s experiment determined that the nucleus of an atom is tiny, dense, and ________________ charged.
positively
negatively
neutrally
randomly
What is the main difference between the Bohr model and the Quantum Mechanical Model of the atom?
The Bohr model includes neutrons, while the Quantum Mechanical Model does not.
The Bohr model has electrons in fixed orbits, while the Quantum Mechanical Model describes electrons in probability clouds.
The Bohr model describes atoms as indivisible, while the Quantum Mechanical Model does not.
The Quantum Mechanical Model has a solid nucleus, while the Bohr model does not.
