Question 1

Which of the following best explains why the second ionization energy ($$IE_2) of $$sodium is much greater than the first ionization energy ($$IE_1$$)?

Accepted Answer

The second electron is removed from a filled shell, which is much closer to the nucleus and more strongly attracted.

Question 2

Which element in the third period has the following successive ionization energies (in kJ/mol): $$IE_1 = 578$, IE_2$ = 1820$$, $$IE_3 = 2750$, IE_4$ = 11,600$$?

Accepted Answer

Silicon

Question 3

Which of the following statements about periodic trends in first ionization energy is correct?

Accepted Answer

First ionization energy increases from left to right across a period.

Question 4

Which element would you expect to have the most negative electron affinity?

Accepted Answer

Fluorine

Question 5

Arrange the following elements in order of increasing metallic character: Si, Cl, Na, Rb.

Accepted Answer

Cl \u003c Si \u003c Na \u003c Rb

Question 6

Which of the following best describes the bonding in NaCl?

Accepted Answer

Electrostatic attraction between oppositely charged ions forming an ionic lattice.

Question 7

According to Coulomb's law, which ionic compound would have the highest lattice energy?

Accepted Answer

LiF

Question 8

Which of the following molecules violates the octet rule due to an incomplete octet?

Accepted Answer

BF$$_3$$

Question 9

Which of the following best describes a resonance structure?

Accepted Answer

A molecule is best represented by an average of multiple valid Lewis structures.

Question 10

What is the formal charge on nitrogen in the best Lewis structure for the thiocyanate ion (SCN$$^-$$)? (Electronegativity: S = 2.5, C = 2.5, N = 3.0)

Accepted Answer

$$-1$$

Question 11

Which of the following bonds is expected to be the most polar based on electronegativity differences?

Accepted Answer

O–Si

Question 12

Which of the following is NOT a property of metals?

Accepted Answer

High ionization energy

Question 13

Which of the following elements is the most electronegative?

Accepted Answer

Fluorine

Question 14

Which of the following molecules can have an expanded octet?

Accepted Answer

PCl$$_5$$

Question 15

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges.

Question 16

Which of the following is the correct order of bond strength for carbon-carbon bonds?

Accepted Answer

Triple \u003e Double \u003e Single

Question 17

Which of the following is true about the dipole moment in a molecule?

Accepted Answer

It has both magnitude and direction.

Question 18

Which of the following is a correct step when writing the Lewis structure for a polyatomic ion?

Accepted Answer

Add one electron for each negative charge.

Question 19

Which of the following is the best explanation for why noble gases are not listed on the electronegativity scale?

Accepted Answer

They have filled highest principal energy levels and do not participate in chemical bonding.

Question 20

Which of the following is the correct formula for Coulomb's law as it applies to lattice energy?

Accepted Answer

$$E = k \frac{q_1$ q_2$}{r}$$

Periodic Trends: Ionization Energy, Electron Affinity, and Chemical Bonding

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