Spring Semester Final Physical Science

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

• covalent bond

• ionic bond

• metallic bond

• electron bond

Which pair of atoms will combine with each other and form an ionic bond?

• C and O

• C and H

• Ca and Mg

• Ca and Br

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

What is the oxidation number of oxygen in most compounds?

• 6

• -2

• 8

• 0

Which formula represents a substance that contains covalent bonds?

• LiCl

• CaCl₂

• K₂O

• CO₂

Tags

NGSS.HS-PS1-1

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.

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

Which process is taking place in the diagram below?

• electron transfer

• electron sharing

• electron gain

• electron loss

How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?

• 2

• 4

• 6

• 8