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Chemistry – Unit 4: Periodic Trends
Part A: Multiple Choice
1. Which element has the lowest electronegativity value?
a. F
b. Fr
c. Cl
d. Cr
2. The elements on the Periodic Table are arranged in order of increasing
a. atomic mass
b. atomic number
c. molar mass
d. oxidation number
3. Which list includes elements with the most similar chemical properties?
a. Br, Ga, Hg
b. Cr, Pb, Xe
c. O, S, Se
d. N, O, F
4. The elements in Group 2 are classified as
a. metals
b. metalloids
c. nonmetals
d. noble gases
5. Which atom has a completely filled valence electron shell?
a. C
b. V
c. Ne
d. Sb
6. Which electron dot structure represents nitrogen?
Version A
7. An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
a. 4−
b. 3−
c. 3+
d. 4+
8. Which atom has the weakest attraction for the electrons in a bond with an H atom?
a. Cl atom
b. F atom
c. O atom
d. S atom
9. Which list of elements contains a metal, a metalloid, a nonmetal, and a noble gas?
a. Be, Si, Cl, Kr
b. C, N, Ne, Ar
c. K, Fe, B, F
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d. Na, Zn, As, Sb
10. An atom of which element has the largest atomic radius?
a. Fe
b. Mg
c. Si
d. Zn
11. Which element requires the least amount of energy to remove the most loosely held electron
from a gaseous atom?
a. bromine
b. calcium
c. sodium
d. silver
12. An atom of which element has the greatest attraction for electrons in a chemical bond?
a. As
b. Ga
c. Ge
d. Se
13. Which electron-dot diagram represents an atom for a Group 13 element?
14. An atom of argon in the ground state tends not to bond with an atom of a different element
because the argon atom has
a. more protons than neutrons
b. more neutrons than protons
c. a total of two valence electrons
d. a total of eight valence electrons
15. Which general trend is found in Period 3 as elements are considered in order of increasing
atomic number?
a. increasing atomic radius
b. increasing electronegativity
c. decreasing atomic mass
d. decreasing ionization energy
Part B: Free-Response
16. Choose two of the three scientists we discussed in this unit. Compare OR contrast their
arrangement of the elements.
17. Explain, in terms of atomic structure, why the elements in Group 2 have similar properties.
18. The ionic radii of some Group 2 elements are given in the table below.
Ionic Radii of Some Group 2 Elements
Symbol
Atomic Number Ionic Radius (pm)
Be
4
44
Mg
12
66
Ca
20
99
Ba
56
134
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a. On the grid on your answer sheet, mark an appropriate scale on the axis labeled “Ionic
Radius (pm).”
b. On the same grid, plot the data from the data table. Circle and connect the points.
c. Estimate the ionic radius of strontium.
d. State the trend in ionic radius as the elements in Group 2 are considered in order of
increasing atomic number.