Unit 3 Test

Which two elements would NOT form an ionic bond?

• calcium and lithium

• calcium and oxygen

• lithium and oxygen

• calcium and carbon

True or False: Sodium and Chloride ions have equal but opposite charges

• True

• False

An example of a covalent compound is

• sodium floride

• calcium chloride

• carbon dioxide

• all of the above

In all covalent bonds, valence electrons are

• lost

• gained

• shared equally

• shared

A compound that contains one nitrogen atom and two oxygen atoms is named

• oxygen nitride

• dioxygen nitride

• nitrogen dioxide

• nitrogen monoxide

What is the chemical formula for the compound containing one nitrogen atom and two oxygen atoms?

• O₂N

• N₂O

• NO

• NO₂

Chemical bonds always involve

• ions

• protons

• metals

• electrons

True or False: An oxygen atom has eight valence electrons

• True

• False

The chemical formula for carbon dioxide is

• CO

• C₂O

• CO₂

• C₂O₂

The correct name for the molecular formula CO is

• carbon monoxide

• carbon dioxide

• calcium oxide

• calcium dioxide