WorksheetsHistory of the Atoms
Total questions: 15
Worksheet time: 39mins
Name
Class
Date
1.
Democritus was known for
a)
discovering the electron
b)
discovering the proton
c)
creating the term atom, meaning indivisible
d)
discovering the nucleus
2.
All matter is made of
a)
energy
b)
atoms
c)
electrons
d)
compounds
3.
Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?
a)
Democritus
b)
Niels Bohr
c)
Ernest Rutherford
d)
Chadwick
4.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
5.
What did James Chadwick discover?
a)
neutrons
b)
electrons
c)
the atomic theory
d)
protons
6.
What scientist is best known for his "Plum Pudding" model of the atom?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
7.
Rutherford and his students did experiments that showed
a)
quark
b)
nucleus
c)
proton
d)
electron
8.
Bohr discovered that electrons are located in
a)
the nucleus
b)
inside protons
c)
electron cloud
d)
circular orbits around the nucleus
9.
Who developed the Quantum Mechanical Model?
a)
Erwin Schrodinger
b)
Joseph Thomson
c)
James Chadwick
d)
Ernest Rutherford
10.
Place the following atomic models in order, from earliest to latest:
A) Rutherford B) Thomson C) Dalton
a)
B, C, A
b)
C, A, B
c)
A, C, B
d)
C, B, A
11.
Which of the following is NOT a part of Dalton's atomic theory?
a)
All elements are composed of atoms.
b)
Atoms are alwyas in motion.
c)
Atoms of the same element are always identical.
d)
Atoms that combine do so in simple, whole-number ratios.
12.
What type of particles exist within an atomic nucleus?
a)
Protons and Neutrons
b)
Neutrons and electrons
c)
Neutrons and Atoms
d)
Elements and Atoms
13.
Which experiment did Robert Milliken perform in order to determine the charge to mass ratio of an electron?
a)
Gold Foil Experiment
b)
Cathode Ray Experiment
c)
Oil Drop Experiment
d)
Plum Pudding Experiment
14.
Which scientist postulated the wave nature of electrons and suggested that all matter has wave properties?
a)
Neils Bohr
b)
Robert Miliken
c)
Ernest Rutherford
d)
Louis de Broglie
15.
According to the wave-mechanical model of the atom, electrons in an atom
a)
travel in defined circles
b)
are most likely found in an excited state
c)
have a positive charge
d)
are located in orbitals outside the nucleus
100 %
