Question 1
Which information was NOT known when Dmitri Mendeleev first devised his periodic
table in 1869?
shared chemical properties among small groups of elements
the tendency of elements to combine with other elements in fixed, whole-number
ratios
atomic weights for all then-known elements
atomic numbers and the existence of subatomic particles
3 points
Question 2
The periodic table has undergone some changes since it was first introduced. List three
ways the modern periodic table differs from the one first published by Mendeleev in
1869.
1. After the noble gases were discovered between 1895 and 1901, they were added to a separate
column under Helium, unlike in Mendeleev's model of the Periodic Table.
2. In Mendeleev's model, several metal elements are placed in the far right column, as he was
not sure what to do with them, in contrast to the modern Periodic Table in which these metals
are organized so that atomic mass continually increases and their properties are similar to those
of the elements in those columns.
3. Several elements, such as gallium, scandium, germanium, and technectium, had not yet been
discovered when Mendeleev created the Periodic Table, but were later added in the modern
version.
5 points
Question 3
Elements on the periodic table appear together in regions based on the energy sub-level
that contains their outermost valence electrons. What are these regions called?
families
blocks
main-group elements
transition elements
3 points
Question 4
Elements show a greater range of properties across a period than within a group.
True
False
2 points
Question 5
Elements that are poor conductors of heat and electricity and break easily are called:
metals
semimetals
nonmetals
metalloids
3 points
Question 6
Which of the following Group 14 elements has the fewest characteristics of a metal?
Silicon
Germanium
Tin
Lead
3 points
Question 7
Which set of elements contains a noble gas?
Ca, K, Hg, As
Ta, Na, Sb, Br
Te, P, Mg, Ar
Ru, Pd, Cd, Na
3 points
Question 8
Which of the following groups of elements has two valence electrons and is highly
reactive?
alkali metals
alkaline earth metals
halogens
noble gases
3 points
Question 9
Elements 104 through 118 are found only in deep sea floor geological deposits along the
subduction zones of tectonic plates.
True
False
2 points
Question 10
Classify the following elements as metal, nonmetal, or metalloid.
nonmetal
metalloid
metal
3 points
Answer
A. chlorine
B. zinc
C. arsenic
Question 11
The atomic mass of an element is the:
combination of neutrons and protons in an atom of that element
weighted average of the masses of known, naturally-occurring isotopes of an
element
number of electrons in an atom of that element
number of protons in an atom of that element
3 points
Question 12
An atom of oxygen contains 8 protons, 8 electrons, and 16 neutrons.
True
False
2 points
Question 13
Hf is the symbol for the element Heffner.
True
False
2 points
Question 14
is the symbol for an isotope of bromine.
True
False
2 points
Question 15
1. Which of the following elements has the largest atomic radius (atomic size)?
hydrogen
lithium
helium
potassium
3 points
Question 16
Which of the following four elements is the least electronegative?
barium (Ba)
magnesium (Mg)
selenium (Se)
fluorine (F)
3 points
Question 17
The electrons in the outermost orbitals of an atom are referred to as:
cations
valence electrons
anions
s-orbitals
3 points
Question 18
1. The electron configuration 1s22s22p3 describes the electrons of the phosphorus atom.
True
False
2 points
Question 19
The electron configuration for antimony is 1s22s22p63s23p64s24d104p65s25d105p3.
True
False
2 points
Question 20
Which element has the electron configuration 1s22s22p63s1?
magnesium
sodium
boron
aluminum
3 points
Question 21
Which of the following elements possesses the most valence electrons?
argon
fluorine
helium
plutonium
3 points
Question 22
The number of valence electrons in the helium atom is
8
7
2
1
3 points
Question 23
Helium is a noble gas and consequently possesses a complete valence of eight electrons.
True
False
2 points
Question 24
The chalcogens possess five electrons in the valence energy level.
True
False
2 points
Question 25
Which element has a Lewis dot structure showing three dots?
Ne atom
Li atom
N atom
B atom
3 points
Question 26
To achieve an octet in the valence energy level, an aluminum atom will gain electrons.
True
False
2 points
Question 27
To achieve an octet of valence electrons, a magnesium atom becomes Mg2+.
True
False
2 points
Question 28
To achieve an octet in the valence energy level, an oxygen atom will gain two electrons.
True
False
2 points
Question 29
Which of the following is formed when a barium atom achieves an octet?
Ba
Ba2Ba2+
Ba2
3 points
Question 30
Which of the following ions forms when iron achieves an octet of valence electrons?
I1I1+
Fe2+
Fe23 points
Question 31
To achieve an octet, the calcium atom forms an ion. The name of this ion is:
calcide ion
calcium ion
calcic ion
calcous ion
3 points
Question 32
The correct name for a Mn4+ cation is:
–manganese ion
–manganese (IV) ion
–manganese-four ion
–manganese4 ion
3 points
Question 33
The suffix for the name of a monatomic anion (negatively charged particle) is:
–ous
–ic
–ide
–ive
3 points
Question 34
Fe2+ is known as the iron (II) ion.
True
False
2 points
Question 35
It is possible for the transition metal zinc to form more than one possible ion.
True
False
2 points
Question 36
It is possible for silver to lose more than one valence electron to form a positive ion.
True
False
2 points
Question 37
Explain how you can use the Lewis Dot structure to determine whether the element
Selenium would form a cation or anion. What is the most common Selenium ion?
The Lewis Dot Structure helps to demonstrate that selenium requires 2 electrons to complete its
octet. Utilizing this knowledge, we can determine that the common ion for selenium is -2, which
means that Selenium would form an anion.