Question 1

Which of the following is the correct ground state electron configuration for phosphorus (Z=15)?

Accepted Answer

1s2 2s2 2p6 3s2 3p3

Question 2

Which element is the most electronegative among the following Group 7A elements?

Accepted Answer

F

Question 3

According to the octet rule, how many valence electrons does oxygen have in a water molecule (H2O)?

Accepted Answer

6 valence electrons

Question 4

What is the formal charge on the central carbon atom in the carbonate ion (CO3^-2) if it is double bonded to one oxygen and single bonded to two other oxygens?

Accepted Answer

0

Question 5

Which of the following is a correct step when drawing a Lewis Dot Structure for CO2?

Accepted Answer

Place carbon in the center because it is less electronegative than oxygen.

Question 6

Which statement about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the placement of electrons, not atoms.

Question 7

What is the hybridization of the central atom in methane (CH4)?

Accepted Answer

sp3

Question 8

Which of the following molecules is polar?

Accepted Answer

NF3

Question 9

Which functional group is present in the following molecule: $$CH_{3}$$COOH?

Accepted Answer

Carboxylic acid

Question 10

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 11

Which principle is violated if two electrons in the same orbital have the same spin?

Accepted Answer

Pauli Exclusion Principle

Question 12

What is the condensed electron configuration for chlorine (Z=17)?

Accepted Answer

[Ne] 3s2 3p5

Question 13

Which of the following molecules is a hydrocarbon?

Accepted Answer

CH_{4}

Question 14

How many unhybridized p orbitals are present on the central atom in ethene ($$C_{2}H$$_{4})?

Accepted Answer

1

Question 15

Which of the following best describes the resonance hybrid of the nitrate ion (NO3^-)?

Accepted Answer

A composite of all major resonance structures, with delocalized electrons.

Question 16

Which of the following statements about molecular polarity is correct?

Accepted Answer

A molecule with a perfect shape and identical surrounding atoms is nonpolar.

Question 17

Which of the following is the correct formal charge calculation for nitrogen in ammonia (NH_{3})?

Accepted Answer

5 - (0 + 6)

Question 18

Which of the following best describes the trend in electronegativity across a period and down a group?

Accepted Answer

Increases from left to right across a period and decreases down a group.

General Chemistry Study Notes: Atomic Structure, Bonding, and Molecular Properties

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