U2E2 Review

What is the name of the NO₃⁻ polyanion?

• nitrite

• nitride

• nitrogen trioxide

• nitrate

Which electron configuration represents a violation of Hund's rule for an atom in its ground state?

• a

• b

• c

• d

Tags

NGSS.HS-PS1-1

The element that has a valence configuration of 4s¹ is _______.

• Li

• Na

• K

• Rb

Tags

NGSS.HS-PS1-1

Which pair of bonded atoms is the least polar?

• C — H

• N — H

• O — H

• O — C

What is the formal charge on the Xe atom in XeF₄?

• 0

• +2

• -4

• +4

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The Lewis structure of N₂H₂ shows ________.

• a nitrogen-nitrogen triple bond

• a nitrogen-nitrogen single bond

• each nitrogen has one nonbonding electron pair

• each nitrogen has two nonbonding electron pairs

How many resonance structures are there for the NO₃⁻ polyatomic ion?

• 1

• 2

• 3

• This molecule does not exhibit resonance.

What is the number of lone pairs of electrons around the central atom of a xenon difluoride molecule?

• 2

• 3

• 4

• 6

The Cl — N — Cl bond angle in the NCl₃ molecule is slightly less than _________.

• 90 °

• 109.5 °

• 120 °

• 180 °

According to VSEPR theory, if there are four electron-rich regions in the valence shell of an atom, they will be arranged in a(n) _________ geometry.

• tetrahedral

• octahedral

• trigonal planar

• trigonal bipyramidal