WorksheetsHistory of the Atom
Total questions: 15
Worksheet time: 15mins
Atoms are neutral because the number of
protons equals the number of neutrons
protons equals the number of electrons
neutrons is greater than the number of protons
neutrons is greater than the number of electrons
The discovery of the electron as a subatomic particle was a result of
collision theory
kinetic molecular theory
the gold-foil experiment
experiments with cathode ray tubes
Which statement describes the charge and location of an electron in an atom?
An electron has a positive charge and is located outside the nucleus.
An electron has a positive charge and is located in the nucleus.
An electron has a negative charge and is located outside the nucleus.
An electron has a negative charge and is located in the nucleus.
Given the list of atomic model descriptions:
A: electron shells outside a central nucleus
B: hard, indivisible sphere
C: mostly empty space
Which list of atomic model descriptions represents the order of the historical development from the earliest to most recent?
A, B, C
A, C, B
B, C, A
B, A, C
Which statement describes the structure of an atom?
The nucleus contains positively charged electrons.
The nucleus contains negatively charged protons.
The nucleus has a positive charge and is surrounded by negatively charged electrons.
The nucleus has a negative charge and is surrounded by positively charged electrons.
The results of the gold-foil experiment led to the conclusion that an atom is
mostly empty space and has a small, negatively charged nucleus
mostly empty space and has a small, positively charged nucleus
a hard sphere and has a large, negatively charged nucleus
a hard sphere and has a large, positively charged nucleus
As a result of the gold foil experiment, it was concluded that an atom
contains protons, neutrons, and electrons
contains a small, dense nucleus
has positrons and orbitals
is a hard, indivisible sphere
The gold foil experiment led to the conclusion that each atom in the foil was composed mostly of empty space because most alpha particles directed at the foil
passed through the foil
remained trapped in the foil
were deflected by the nuclei in gold atoms
were deflected by the electrons in gold atoms
Which sequence represents a correct order of historical developments leading to the modern model of the atom?
the atom is a hard sphere --> most of the atom is empty space --> electrons exist in orbitals outside the nucleus
the atom is a hard sphere --> electrons exist in orbitals outside the nucleus --> most of the atom is empty space
most of the atom is empty space --> electrons exist in orbitals outside the nucleus --> the atom is a hard sphere
most of the atom is empty space --> the atom is a hard sphere -->electrons exist in orbitals outside the nucleus
An orbital is defined as a region of the most probable location of
an electron
a neutron
a nucleus
a proton
According to the wave mechanical model of the atom, electrons are located in
orbitals
circular paths
a small, dense nucleus
a hard, indivisible sphere
According to the wave-mechanical model, an orbital is defined as the
circular path for electrons
circular path for neutrons
most probable location of electrons
most probable location of neutrons
Four statements about the development of the atomic model are shown below.
A: Electrons have wavelike properties.
B: Atoms have small, negatively charged particles.
C: The center of an atom is a small, dense nucleus.
D: Atoms are hard indivisible spheres.
Which order of statements represents the historical development of the atomic model?
C --> D --> A --> B
C --> D --> B --> A
D --> B --> A --> C
D --> B --> C --> A
According to the modern model of the atom, the nucleus of an atom is surrounded by one or more
electrons
protons
neutrons
croutons
Experimental evidence indicates that the nucleus of an atom
contains most of the mass of an atom
contains a small percentage of the mass of an atom
has no charge
has a negative charge
