E & S Science Test

The force that holds two atoms together is called 

Chemical bond

____ is a measure of the strength of a chemical bond

Bond energy

When atoms rearrange to form new combinations, a ____ has taken place

Chemical reaction

Electrons in the highest principle energy level are in the

Valence shell

There are several extremely unreactive elements. Each of these is called

Noble gas

The atoms of all but the lightest of these elements

have a set of eight outermost electrons, which form a

stable octet

When electrons are transferred from one atom to another, a(n)

_______ _______is formed between the resulting charged atoms.

Ionic bond

A positively charged atom is called a(n) _________

Cation

A negatively charged atom is called a(n) _________

Anion

An element that has only one or two valence electrons is categorized as a(n) _________.

Metal

When atoms share electrons, a(n) _________ ________ is formed.

Covalent bond

An uncharged group of atoms held together in this way is called a(n) ___________.

Molecule

A ___________ _______ _________ is a visual way to

express the number of valence electrons in an atom of an element.

Lewis dot diagram

________________ is a measure of the attraction of an atom for

electrons in a chemical bond.

Electronegativity

A strong bond between two metals is called a(n) __________ ___________.

Metallic bond

A bond such as that between a hydrogen atom of one water molecule and the oxygen atom of another is called a(n)

Hydrogen bond

A weak force of attraction between molecules that arises because of shifting positions of electrons is called a

Van der waals force

A bond between a metal and a nonmetal

Ionic bond

Compounds formed between nonmetals

Covalent molecular compound

a slight positive charge on one end and a slight negative charge on the other due to an uneven distribution of electrons.

Polar molecule

equally charged electrons

non polar molecule