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WorksheetsThe Structure of the Atom
Total questions: 14
Worksheet time: 7mins
Democritus believed that matter was made up of _______
earth
fire
atoms
water
Aristotle said that ________ cannot exist.
atoms
empty space
air
fire
Which of the following parts of John Dalton's atomic theory were not correct?
matter is composed of atoms
atoms are indivisible
atoms of one element differ from atoms of another
atoms combine to form compounds
In the figure above, if atoms of element A have a mass of 16 units and atoms of element B have a mass of 1 unit, what will be the total mass?
72 units
12 units
18 units
17 units
John Dalton's ideas about atoms were similar to those of __________.
Aristotle
Plato
Socrates
Democritus
What can you conclude from the deflection of a cathode ray in a magnetic field?
The ray must be composed of charged particles.
The ray must be composed of iron.
The ray must have a positive charge.
The ray must need to travel in a vacuum.
What properties did Rutherford use in the design of the gold foil experiment?
alpha particle's negative charge and random distribution of protons
alpha particle's negative charge and gold foil's positive charge
alpha particle's positive charge and electron's negative charge
positively charged electrons distributed in a uniform negative charge
Which of the following particles has a mass that is almost the same as the mass of a proton?
neutron
electron
positron
beta particle
Which scientist determined that almost all of an atom's mass of is located in its nucleus?
Dalton
Democritus
Rutherford
Thomson
In the plum pudding model of the atom, where is most of the mass of the atom?
in the electrons
in the matter between the electrons
in the nucleus
in the protons
Why are all atomic masses not nearly whole numbers?
This is due to the mass of all the electrons in the atom.
This is because of experimental error.
This is because atomic masses are the weighted average of the masses of all naturally-occurring isotopes.
This is due to binding energy of the atoms.
The atomic number of an element is defined by its number of ________.
protons
neutrons
electrons
nuclei
The sum of the protons and neutrons in a nucleus is __________.
the atomic number
the mass number
Avogadro's number
the element number the element number
Which of the following is true for any atom?
atomic number = number of protons = number of electrons
atomic number = number of neutrons = number of electrons
mass number = number of protons = number of electrons
mass number = number of protons = number of neutrons
