WorksheetsQUIZ #6 - Atomic Theory (GenChem)
Total questions: 28
Worksheet time: 26mins
Who first suggested the existence of atoms?
Dalton
Democritus
Rutherford
Aristotle
What does the word "atomos" mean in Greek?
Smallest unit
Invisible
Indivisible
Indestructible
Which scientist is known for the Law of Definite Proportions?
Lavoisier
Proust
Dalton
Thompson
According to Dalton’s atomic theory, atoms of the same element are:
Always different
Indestructible but not identical
Identical in every way
Variable in mass
What instrument allows scientists to observe individual atoms?
Mass spectrometer
Cathode ray tube
Scanning tunneling microscope
Electron balance
What subatomic particle did J.J. Thomson discover using the cathode ray tube?
Proton
Neutron
Electron
Nucleus
What charge does an electron carry?
Positive
Neutral
Negative
Variable
Who discovered the neutron?
J.J. Thomson
Millikan
Rutherford
Chadwick
The relative mass of a proton is approximately:
0
1
1/1840
1840
The “plum pudding” model was proposed by:
Rutherford
Bohr
Thomson
Dalton
In Rutherford’s gold foil experiment, most alpha particles:
Were absorbed
Deflected completely
Bounced back
Passed straight through
Which of the following is not part of Dalton's atomic theory?
Atoms are indivisible
Atoms of the same element are identical
Electrons orbit the nucleus
Chemical reactions rearrange atoms
What defines the identity of an element?
Number of electrons
Atomic mass
Number of neutrons
Number of protons
Which of the following is an isotope of carbon?
Carbon-12
Carbon-14
What is the unit used for atomic mass?
Grams
Kilograms
amu
Neutrons
Atoms are indivisible and indestructible.
TRUE
FALSE
The atomic number is equal to the number of protons.
TRUE
FALSE
All atoms of the same element have the same number of neutrons.
TRUE
FALSE
Electrons are found inside the nucleus.
TRUE
FALSE
The average atomic mass accounts for isotope abundance.
TRUE
FALSE
Name the three main subatomic particles and state their charges.
What was the key finding of Rutherford’s gold foil experiment?
What is the formula for calculating the number of neutrons in an atom?
Define isotope.
Find the Number of Protons, Electrons, and Neutrons of:
Arsenic - 75
Find the Number of Protons, Electrons, and Neutrons of:
Molybdenum - 96
Find the A of:
Barium
Find the A of:
Antimony
