chem ch 6

A chemical bond between atoms results from the attraction between the valence electrons __ and of different atoms.

nuclei

A covalent bond consists of

a shared electron pair.

If two covalently bonded atoms are identical, the bond is identified as

nonpolar covalent.

A covalent bond in which there is an unequal attraction for the shared electrons is

polar.

Atoms with a strong attraction for electrons they share with another atom exhibit

high electronegativity.

Bonds that possess between 5% and 50% ionic character are considered to be

polar covalent.

The greater the electronegativity difference between two atoms bonded together, the greater the bond’s percentage of

ionic character.

The electrons involved in the formation of a chemical bond are called

valence electrons

A chemical bond that results from the electrostatic attraction between positive and negative ions is called a(n)

ionic bond

If electrons involved in bonding spend most of the time closer to one atom rather than the other, the bond is .

polar covalent

If a bond’s character is more than 50% ionic, then the bond is called a(n)

ionic bond

A bond’s character is more than 50% ionic if the electronegativity difference between the two atoms is greater than

1.7

What property of the two atoms in a covalent bond determines whether or not the bond will be polar?

electronegativity

In a crystal of an ionic compound, each cation is surrounded by a number of

negative ions.

Compared with the neutral atoms involved in the formation of an ionic compound, the crystal lattice that results is

lower in potential energy.

What type of energy best represents the strength of an ionic bond?

lattice energy

the charge of an ion is

either positive or negative

octect rule

atoms want to have 8 electrons in their valance shell, so it will gain or loose 2 electrons to have 8

if a compound forms by bonding what is not true

the compound contains just 2 atoms each of opposite charge

the only property listed that is not chacterustic of ionic compounds is

lack of crystal stucture

polyatomic ion

ions which conists of one or more atoms

the crystal structure of an ionic compound depends on the

size of the cations and anions and the ratio of cations to anions

the melting point of ionic compound are higher that the melting points of molecular copunds beacuse

attractive forces between ions are greater than the attractive forces between molecules

a covalent bond is formed when tw atoms

share one or more pairs of electrons with eachother