quiz 9

A triple bond consists of ________ pairs of electrons shared between two atoms.

3

How many equivalent resonance forms can be drawn for CO32-? (Carbon is the central atom.)

3

The halogens, alkali metals, and alkaline earth metals have ________ valence electrons, respectively.

7, 1, and 2

Of the molecules below, the bond in ________ is the most polar. [Recall: F is the most electronegative atom] HI HCl H2 HBr HF

HF

The only noble gas without eight valence electrons is ________.

He

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

O—H

The Lewis structure of PF3 shows that the central phosphorus atom has ________ nonbonding electron pair(s) and ________ bonding electron pair(s).

1, 3

The ion NO- has ________ valence electrons.

12

Based on the octet rule, magnesium most likely forms a ________ ion.

Mg2+

How do you calculate formal charge

atom's valence electrons - bonding electrons/2 - non-bonding electrons

The ability of an atom in a molecule to attract electrons is best quantified by the ________.

electronegativity