The chemical bond formed when two atoms share electrons is called a(n) _______.

• Covalent bond

• Ionic bond

• Metallic bond

• Electron bond

The pair of atoms that will combine with each other and form an ionic bond is (a)  

• C and O
• C and H
• Ca and Mg
• Ca and Br

Tags

NGSS.HS-PS1-3

Which element is most likely to gain electrons in a chemical reaction?

• Kr

• K

• Br

• Ca

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match the following oxidation states with the elements in most compounds.

• Oxidation Number of Nitrogen

• +2

• Oxidation number of Calcium

• -2

• Oxidation number of oxygen

• 0

• Oxidation number of noble gases

• -3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which formula represents a substance that contains covalent bonds?

• LiCl

• CaCl₂

• K₂O

• CO₂

A regular, repeating arrangement of atoms, ions, or molecules is ____________.

• A compound

• A crystal

• Impossible to break

• A polyatomic ion

Tags

NGSS.HS-PS1-3

How does an atom of aluminum become an ion?

• It gains 3 electrons

• It gains 3 protons

• It loses 3 electrons

• It loses 3 neutrons

Tags

NGSS.MS-PS1-5

How many electrons are shared within a single bond?

• 0

• 1

• 2

• 4

Which atoms are most likely to form covalent bonds?

• metal atoms that share electrons

• metal atoms that share protons

• nonmetal atoms that share electrons

• nonmetal atoms that share protons

The electrons that are lost, gained, or shared in chemical bonds are called ___________.

• valence electrons

• chemical electrons

• Lewis electrons

• none of the above

Tags

NGSS.HS-PS1-2