Question 1

Which of the following best explains why the atomic radius increases as you move down a group in the periodic table?

Accepted Answer

Additional electron shells are added, increasing the distance of the outermost electrons from the nucleus.

Question 2

Given the following atomic radii: C (0.76 Å), B (0.84 Å), Si (1.11 Å), Al (1.21 Å), arrange these elements in order of increasing atomic radius.

Accepted Answer

C \u003c B \u003c Si \u003c Al

Question 3

Which of the following ions is expected to have the largest ionic radius in the isoelectronic series: S$$^{2-}$$, Cl$$^-$$, K$$^+$$, Ca$$^{2+}$$?

Accepted Answer

S$$^{2-}$$

Question 4

Estimate the bond length of the S—H bond in methyl mercaptan (CH$$_3SH) $$using the bonding atomic radii: S = 1.05 Å, H = 0.31 Å.

Accepted Answer

$$1.36\ 	ext{Å}$$

Question 5

Which of the following statements about ionization energy is TRUE?

Accepted Answer

Ionization energy increases as you move from left to right across a period.

Question 6

Which of the following equations represents the third ionization energy of bromine?

Accepted Answer

$$\mathrm{Br$$^{2+}$$(g) \rightarrow Br$$^{3+}$$(g) + e^-}$$

Question 7

Which of the following oxides is expected to form an acidic solution in water?

Accepted Answer

SO$$_2$$

Question 8

What is the electron configuration for the Co$$^{3+}$$ ion?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^6$

Question 9

A cube of bismuth metal has an edge length of 5.00 cm and a density of 9.808 g/cm$$^3. $$How many moles of Bi are present in the cube? (Atomic mass of Bi = 209.0 g/mol)

Accepted Answer

$$5.87\ 	ext{mol}$$

Question 10

Which of the following best describes the trend in metallic character as you move down group 5A (15) in the periodic table?

Accepted Answer

Metallic character increases.

Question 11

Which of the following balanced equations represents the reaction of scandium oxide with nitric acid?

Accepted Answer

$$\mathrm{Sc_2O_3(s) + 6\ $$HNO_3$$(aq) \rightarrow 2\ Sc(NO_3$)_3(aq) + 3\ H_2O(l)}$$

Question 12

Which of the following ions is expected to be the largest in the isoelectronic series: Ca$$^{2+}$$, Cs$$^+$$, Y$$^{3+}$$?

Accepted Answer

Cs$$^+$$

Question 13

Which of the following best explains why the second ionization energy of sodium is much higher than its first ionization energy?

Accepted Answer

The second electron is removed from a core shell, which is much closer to the nucleus.

Question 14

Which of the following is the correct net ionic equation for the reaction of Bi$$_2O$_3$$ with acid?

Accepted Answer

$$\mathrm{Bi_2O_3(s) + 6\ H^+(aq) \rightarrow 2\ Bi$$^{3+}$$(aq) + 3\ H_2O(l)}$$

Question 15

Which of the following best describes the electron configuration of S$$^{2-}$$?

Accepted Answer

$$[\mathrm{Ne}]\ 3s^2$\ 3p^6$

Question 16

Which of the following reactions represents the reaction of cesium metal with water?

Accepted Answer

$$2\ \mathrm{Cs(s) + 2\ H_2O(l) \rightarrow 2\ CsOH(aq) + H_2$(g)}$$

General Chemistry Study Guide: Atomic Radii, Bond Lengths, Ionization Energies, and Periodic Trends

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