atoms
For questions 1 and 2, consider the following orbitals: 4f, 5d, 6s, 6p.
1. Following Aufbau's principle, which orbital must be filled last?
o a. 6s
o
o
b. 5d
c. 4f
periodic table
o d. 6p
1. Which of the following can be considered as Dobereiner’s triad?
2. Which of the following correctly arranges the given orbitals from
first orbital to last orbital to be filled with electrons? o He: 4.0, Li: 6.9, Na: 23.0
o N: 14.0, P: 40.0, At: 217.0
o a. 4f < 5d < 6p < 6s o Ne: 20.2, Ar: 39.9, Kr: 83.8
o b. 5d < 4f < 6p < 6s o Ca: 40.1, Sr: 87.6, Ba: 137.3
o c. 6s < 4f < 5d < 6p
o d. 6s < 5d < 4f < 6p 2. Which of the following elements does not belong to the group?
3. One of the sets of quantum numbers below is impossible. Which o N
one is it? o S
o Po
o a. (1, 1, 0, +½) o Te
o b. (2, 1, -1, -½)
o c. (3, 2, 0, +½) 3. Which of the following is/are TRUE about boron and oxygen?
o d. (4, 0, 0, -½)
o both are metalloids
For questions 4 and 5, consider the 25th element in the periodic table, o boron is smaller than oxygen
Mn. o boron is more electronegative than oxygen
o higher energy is required to eject an electron from the
4. What is the electron configuration of Mn? valence shell of boron
o all of the above
o none of the above
o a. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²
o b. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d⁵
o c. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵ For 4 and 5, consider Na, Mg Al, and Si.
o d. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s¹
4. The element that ejects one electron from its valence shell most
readily is ________.
5. Which of the following set of quantum numbers corresponds to the
labeled electron (marked red below) in the d orbital of Mn?
o Na
o a. (3, 2, -1, +½) o Mg
o Al
o b. (3, 2, +2, +½)
o Si
o c. (4, 2, -1, +½)
o d. (4, 2, +2, +½)
5. Which element has the most negative electron affinity?
o Na
o Mg
o Al
o Si
compounds
1. What is the correct chemical name for water?
o oxygen dihydride
o dihydrogen monoxide o None of the above
o monoxygen dihydride
o all of the above
9. Between compounds A and C, which has a higher boiling point?
2. Which of the following is the correct chemical formula for
ammonium arsenate? o Compound A because it is a tetrahedral molecule.
o Compound C because it has stronger
o (NH₄)₃AsO₄ intermolecular forces of attraction.
o (NH₃) ₄AsO₃ o Since compounds A and C have approximately
o NH₄ (AsO₄)₃ the same molar mass, they willboil at the same
o (AsO₄)₃ (NH₄)₄ temperature.
o More information is needed.
3. When an electron-rich atom donates a lone pair to form a bond
with an electron-poor atom, the bond is called a/an _____________ 10. Which of the following statements is/are TRUE?
bond.
o Compounds A, B, and C have similar electron
o ionica pair geometry.
o dative o The electron pair geometry of compounds B and
o covalent C is trigonal pyramidal.
o metallic o The electron pair geometry and molecular
geometry of compound C are both trigonal
4. What is the oxidation number of sulfur in the ionic compound
pyramidal.
sodium thiosulfate?
o All of the above
o -4 o None of the above
o -2
o +2
o +4
5. Which of the following statements is FALSE?
o The oxidation number of oxygen is always -2.
o The oxidation number of aluminum is always +3.
o The oxidation number of fluorine is always -1.
o Pure copper has an oxidation number of zero.
o All of the above
o None of the above
6. How many grams of carbon are there in 50 g of CO2 (MM C = 12;
MM O = 16)?
o 21.4 g
o 18.2 g
o 13.7 g
o 36.4 g
For numbers 7-10, refer to the following set of compounds:
7. Which of the three compound/s is/are nonpolar?
o A
o B
o C
o All of the above
o None of the above
8. Which of the three compounds exhibit London dispersion forces?
o A
o B
o C.
o All of the above
