$$\text{Formal charge} = \text{valence electrons} - \text{bonds} - \text{nonbonding electrons}$$

Question 1

Which of the following elements is most likely to form four covalent bonds in organic molecules due to its tetravalency?

Accepted Answer

Carbon

Question 2

According to the octet rule, which of the following atoms is LEAST likely to obey the rule in its common compounds?

Accepted Answer

Aluminum

Question 3

What is the formal charge on the nitrogen atom in the nitrate ion $$\mathrm{NO_3$^-}$$?

Accepted Answer

$$0$$

Question 4

Which principle states that electrons fill the lowest energy orbitals first?

Accepted Answer

Aufbau Principle

Question 5

Given the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^5$$, which element is this?

Accepted Answer

Fluorine

Question 6

Which of the following molecules is nonpolar due to its symmetrical geometry, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 7

What is the correct electron configuration for the oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 8

Which atom is the most electronegative according to the Pauling scale?

Accepted Answer

Fluorine

Question 9

In the Lewis structure for $$\mathrm{CH_3OH} ($$methanol), how many lone pairs are present on the oxygen atom?

Accepted Answer

Two

Question 10

Which of the following best describes the role of electrons in chemical bonding?

Accepted Answer

Electrons take part in chemical bonding

Question 11

A molecule has a central atom with three bonds and one lone pair. What is the expected molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 12

Which of the following is the correct formula for calculating formal charge?

Accepted Answer

$$	ext{Formal charge} = 	ext{valence electrons} - 	ext{bonds} - 	ext{nonbonding electrons}$$

Question 13

Which of the following statements about the Pauli Exclusion Principle is correct?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers

Question 14

Which of the following is a correct application of Hund's Rule?

Accepted Answer

Each degenerate orbital is singly occupied before any is doubly occupied

Question 15

Which of the following molecules contains a double bond?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

If a molecule has a formal charge of $$-1$$, what adjustment should be made when drawing its Lewis structure?

Accepted Answer

Add one electron to the total valence electrons

Question 17

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

It has a bent geometry and a difference in electronegativity between H and O

Question 18

Which element is most likely to expand its octet beyond eight electrons?

Accepted Answer

Aluminum

Question 19

Which of the following is the correct order of electronegativity for the halogens listed?

Accepted Answer

F \u003e Cl \u003e Br \u003e I

Question 20

A student draws the Lewis structure for $$\mathrm{HCN} ($$hydrogen cyanide). How many bonds are between carbon and nitrogen?

Accepted Answer

Three

Fundamentals of Atomic Structure, Bonding, and Electronegativity in Organic Chemistry

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