Properties of Atoms and the Periodic Table
Practice Test
1.
Democritus believed that the universe was made of empty space and __________.
a.
elements
b.
atoms
c.
molecules
d.
compounds
Hint
2.
The negatively charged particles outside the nucleus of an atom are __________.
a.
extracellular material
b.
electrons
c.
neutrons
d.
quarks
Hint
3.
The __________ is a chart created by chemists to organize the elements according to repeated changes on properties.
a.
periodic table
b.
metalloid list
c.
isotope
d.
mass number
Hint
4.
The __________ of an element is the number of __________ of an atom of that element.
a.
mass number, neutrons in the nucleus
b.
atomic number, protons in the nucleus
c.
mass number, protons plus neutrons in the outermost energy level
d.
atomic mass, electrons in the nucleus
Hint
5.
Which of the following atomic particles is positively charged?
a.
neutron
b.
negatron
c.
proton
d.
electron
Hint
6.
The atomic number of manganese is 25; its mass number is 55. How many neutrons does an atom of manganese have in its nucleus?
a.
80
b.
55
c.
25
d.
30
Hint
7.
Who formed the first periodic table?
a.
Democritus
b.
Moseley
c.
Mendeleev
d.
Dalton
Hint
8.
An atom containing six positive charges and six negative charges has __________ charge.
a.
a positive
b.
a strong negative
c.
a negative
d.
no net
Hint
9.
Atoms consist of a positively charged center called a(n) __________.
a.
nucleus
b.
electron
c.
neutron
d.
proton
Hint
10.
Which of the following best describes the three general groups of elements?
a.
metals, nonmetals, and noble gases
b.
solid, liquid, and gas
c.
metals, metalloids, and synthetics
d.
metals, metalloids, and nonmetals
Hint
11.
Which of the following atomic particles is electrically neutral?
a.
proton
b.
positron
c.
neutron
d.
electron
Hint
12.
What nineteenth-century English scientist offered proof that atoms existed?
a.
Isaac Newton
b.
John Dalton
c.
Aristotle
d.
Democritus
Hint
13.
Which of the following methods would be most useful for describing atoms?
a.
visualizing with a microscope
b.
observing in a test tube
c.
touching with bare hands
d.
constructing a model
Hint
14.
Which of the following models of the atom reflects the unpredictable motion of the electron?
a.
small ball within a large shell containing empty space
b.
solid ball the same throughout
c.
ball of raisin-cookie dough with raisins representing electrons
d.
electron cloud
Hint
15.
The __________ of an atom is the number of neutrons plus protons.
a.
nucleus number
b.
half-life
c.
atomic number
d.
mass number
Hint
16.
The mass of an electron is __________.
a.
negligible
b.
equal to the mass of the nucleus
c.
the mass of the neutrons plus the mass of the protons
d.
equal to the mass of a proton
Hint
17.
Aristotle believed that matter was __________.
a.
composed of molecules
b.
composed of atoms
c.
uniform throughout
d.
capable of being broken down into smaller parts
Hint
18.
Which of the following is the correct chemical symbol for carbon?
a.
Crbn
b.
Car
c.
C
d.
Ca
Hint
19.
__________ are atoms of the same element that have different numbers of neutrons.
a.
Compounds
b.
Isotopes
c.
Alpha particles
d.
Beta particles
Hint
20.
The mass of a proton is measured in __________.
a.
microns
b.
atomic mass units
c.
minutiae
d.
nanograms
Hint
