quiz 9 – Flashcards
Unlock all answers in this set
Unlock answersquestion
The only noble gas without eight valence electrons is ________.
answer
He
question
The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively.
answer
7, 1, and 2
question
Based on the octet rule, magnesium most likely forms a ________ ion.
answer
Mg2+
question
A triple bond consists of ________ pairs of electrons shared between two atoms.
answer
3
question
The ability of an atom in a molecule to attract electrons is best quantified by the ________.
answer
electronegativity
question
Given the electronegativities below, which covalent single bond is most polar?
Element: H C N O
Electronegativity: 2.1 2.5 3.0 3.5
answer
O—H
question
Of the molecules below, the bond in ________ is the most polar. [Recall: F is the most electronegative atom]
HI
HCl
H2
HBr
HF
answer
HF
question
The ion NO- has ________ valence electrons.
answer
12
question
The Lewis structure of PF3 shows that the central phosphorus atom has ________ nonbonding electron pair(s) and ________ bonding electron pair(s).
answer
1, 3
question
How many equivalent resonance forms can be drawn for CO32-? (Carbon is the central atom.)
answer
3
question
How do you calculate formal charge
answer
atom's valence electrons - bonding electrons/2 - non-bonding electrons
