WorksheetsAtomic Theory and Atomic Structure
Total questions: 15
Worksheet time: 15mins
Order the atomic models below from the oldest to the most recent.
2, 1, 3, and 4
1, 2, 4, and 3
3, 2, 4, and 1
3, 1, 2, and 4
Which scientist proposed a model of the atom in which the individual atoms were thought of as tiny solids like balls or marbles?
John Dalton
James Chadwick
Ernest Rutherford
J.J. Thomson
One of the Dalton's conclusions concerning his atomic theory was that all the atoms of the same element are ___.
the same
different
combined
reacted
Which atomic model has a positively charged nucleus and a negatively charged cloud of electrons giving the atom its size?
Modern Theory Model
Plum-pudding Model
Planetary Model
Marble Model
Which of the following correctly describes the electron cloud model?
Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.
Electrons are found in fixed orbitals around a positive nucleus.
All of an atom's mass is concentrated in the electron cloud around the nucleus.
Electrons are evenly embedded throughout a positively charged sphere.
According to modern atomic theory, electrons are found ___.
occupying unspecified regions around the nucleus, based on how much energy each electron has
in totally random and varying orbits around the nucleus
in fixed orbits at well-defined distances from the nucleus
closely attached to the nucleus
Whose model of an atom is displayed in the picture?
Thomson
Rutherford
Dalton
Bohr
Whose model of an atom is displayed in the figure?
Bohr
Rutherford
Thomson
Modern Model
Which of the following correctly orders the atomic models from the oldest to the most recent?
Dalton, Thomson, Rutherford, Bohr, Electron Cloud
Dalton, Thomson, Bohr, Electron Cloud, Rutherford
Thomson, Dalton, Rutherford, Electron Cloud, Bohr
Electron Cloud, Bohr, Rutherford, Thomson, Dalton
The atomic mass number consists of
the total number of electrons and protons
the total number of protons and neutrons
the number of protons
the total number of electrons and neutrons
Which subatomic particles make up the nucleus of an atom?
protons and neutrons
electrons and protons
electrons, protons, and neutrons
electrons and neutrons
What charge does the nucleus have and why?
positive - the neutrons do not have a charge and the protons are positively charged
negative - the neutrons do not have a charge and the electrons are negatively charged
neutral - the charge of the neutron dominates the positive charge of the proton
neutral - electrons negative charge cancel out the positive charge of the proton
Which scientist is credited with the discovery of the electron, leading to the development of the plum-pudding model of the atom?
A) Niels Bohr
B) J.J. Thomson
C) Ernest Rutherford
D) John Dalton
In the Rutherford gold foil experiment, what was the main observation that led to the conclusion that the atom has a small, dense nucleus?
A) Most alpha particles passed through the foil without deflection.
B) Alpha particles were absorbed by the foil.
C) Alpha particles were deflected at large angles.
D) Alpha particles were scattered evenly in all directions.
Which of the following statements about isotopes is correct?
A) Isotopes have the same number of protons but different numbers of neutrons.
B) Isotopes have different numbers of protons and neutrons.
C) Isotopes have the same number of neutrons but different numbers of electrons.
D) Isotopes have different numbers of electrons but the same number of protons.
