Q: Which of the following is the correct formula for calculating the formal charge of an atom in a molecule?

Formal Charge=Valence Electrons−(Nonbonding Electrons+Bonds)

Question 1

Which of the following electron configurations correctly represents the ground state of phosphorus (Z = 15)?

Accepted Answer

1s22s22p63s23p3

Question 2

According to the periodic trend, which element has the highest electronegativity among the following?

Accepted Answer

Cl

Question 3

What is the formal charge on the central carbon atom in the thiocyanate ion (SCN-) given the following Lewis structure: N&#x2261;C&#x2212;S?

Accepted Answer

0

Question 4

Which statement best describes the octet rule as it applies to oxygen in the molecule H3C&#x2212;O&#x2212;H?

Accepted Answer

Oxygen possesses 8 octet electrons: 6 valence and 2 shared electrons.

Question 5

Which of the following molecules is polar?

Accepted Answer

Nitrogen trifluoride (NF3)

Question 6

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

Accepted Answer

[Ne]3s23p5

Question 7

Which of the following is the correct formula for calculating the formal charge of an atom in a molecule?

Accepted Answer

Formal&#xA0;Charge=Valence&#xA0;Electrons&#x2212;(Nonbonding&#xA0;Electrons+Bonds)

Question 8

Which principle is violated in the following electron configuration diagram for oxygen: 1s22s22p4 where two electrons are paired in one 2p orbital before all 2p orbitals are singly occupied?

Accepted Answer

Hund's Rule

Question 9

How many resonance structures are possible for the nitrate ion (NO3-)?

Accepted Answer

3

Question 10

What is the hybridization of the central atom in carbon dioxide (CO2)?

Accepted Answer

sp

Question 11

Which of the following is a hydrocarbon functional group?

Accepted Answer

Alkene

Question 12

Which molecule below is both organic and a hydrocarbon?

Accepted Answer

CH4

Question 13

What is the atomic number of carbon?

Accepted Answer

6

Question 14

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers.

Question 15

What is the charge and electron count for a hydride ion (H-)?

Accepted Answer

Charge: -1, Electrons: 2

Question 16

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

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

Question 17

Which of the following molecules contains a carbonyl functional group?

Accepted Answer

Acetone

Question 18

What is the hybridization and number of unhybridized orbitals for the central atom in HCN?

Accepted Answer

Hybridization: sp; Unhybridized orbitals: 2

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