Ionic Compound Formula

What is the first step in writing an ionic compound formula?

• Identify the cation and anion

• Reduce the subscripts

• Use the crisscross method

• Write the final formula

Which ion is typically written first in an ionic compound formula?

• Neutral atom

• Polyatomic ion

• Cation

• Anion

What is the charge of a sodium ion?

• 2-

• 2+

• 1+

• 1-

In the crisscross method, what becomes the subscript for the anion?

• The atomic number of the cation

• The atomic number of the anion

• The charge of the anion

• The charge of the cation

What is the final formula for sodium oxide?

• NaO

• Na2O

• NaO2

• Na2O2

Tags

NGSS.HS-PS1-1

What is the charge of an oxide ion?

• 2-

• 2+

• 1-

• 1+

What is the correct formula for magnesium chloride?

• MgCl

• MgCl2

• Mg2Cl3

• Mg2Cl

How do you determine the charge of an ion?

• By its position in the periodic table

• By its atomic mass

• By its atomic number

• By its electron configuration

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct formula for aluminum sulfide?

• AlS

• Al2S3

• Al3S2

• AlS2

What is the charge of a calcium ion?

• 1+

• 2+

• 1-

• 2-