Chemistry Questions 8-10 Periodic Table
Copy each question and correct answer. Explain your choice of correct answer.
8. Which of the following ordered pairs of elements shows an
increase in atomic number but a decrease in average atomic
mass?
A Ag to Pd
B Co to Ni
C Ge to Sn
D Cr to Mo
•explain your choice of correct answer.
9 Why is cobalt (Co) placed before nickel (Ni) on the periodic table
of the elements even though it has a higher average atomic mass
than nickel?
A Nickel has one more proton.
B Cobalt was discovered first.
C Nickel has fewer electrons.
D Cobalt has a lower density.
•explain your choice of correct answer.
10 Generally, how do atomic masses vary throughout the periodic
table of the elements?
A They increase from left to right and top to bottom.
B They increase from left to right and bottom to top.
C They increase from right to left and top to bottom.
D They increase from right to left and bottom to top.
•explain your choice of correct answer.
Released STAR Question 8 Periodic Table
8. Which of the following ordered pairs of
elements shows an increase in atomic
number but a decrease in average atomic
mass?
A Ag to Pd
B Co to Ni
C Ge to Sn
D Cr to Mo
Nickel has one more proton than cobalt. Nickel’s
atomic number is 28, cobalt’s is 27, yet nickel has a
lower atomic mass (58.69amu)than cobalt (58.93amu)
Released STAR Question 9 Periodic Table
9 Why is cobalt (Co) placed before nickel (Ni) on
the periodic table of the elements even though it
has a higher average atomic mass than nickel?
A Nickel has one more proton.
B Cobalt was discovered first.
C Nickel has fewer electrons.
D Cobalt has a lower density
Elements in the periodic table are arranged by atomic
number (number of protons).
Released STAR Question 10 Periodic Table
10 Generally, how do atomic masses vary
throughout the periodic table of the elements?
A They increase from left to right and top to bottom.
B They increase from left to right and bottom to top.
C They increase from right to left and top to bottom.
D They increase from right to left and bottom to top.
•explain your choice of correct answer.
Because elements are arranged by atomic number,
their atomic mass generally also increases from left to
right and top to bottom. There are exceptions (Co - Ni)
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question 11
Periodic Table
11. Iodine would have chemical properties most like
A manganese (Mn).
B tellurium (Te).
C chlorine (Cl).
D xenon (Xe).
Elements in the same column or group have similar chemical properties.
Of these choices, only chlorine is in the same group as iodine (the
halogens).
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question 12
Periodic Table
12. The chart above shows the relationship between the first
ionization energy and the increase in atomic number. The letter
on the chart for the alkali metals family of elements is
A W.
B X.
C Y.
D Z.
•explain your choice of correct answer.
Ionization energy increases from left to right then dereases when you
move down a period. The chart shows ionization energy increasing from
W to X, but decreasing suddenly. That sudden drop in ionization energy
happens when you move from the noble gas to the alkali metal in each
period.