Writing Ionic Formulas

Writing Ionic Compound Formulas

8th Grade Chemistry

Multiple Choice

How do we know if an atom has a positive charge?

• 4 or less Valence Electrons = positive

• 5 or more Valence Electrons = positive

Multiple Choice

How do we know if an atom has a negative charge?

• 4 or less Valence Electrons = Negative

• 5 or more Valence Electrons = Negative

Multiple Choice

How do we find the charge of an atom with 4 or less Valence Electrons?

• # of Valence Electrons = Charge

• Valence Electrons - 8 = Charge

• 8 - Valence Electrons = Charge

• 8 = Charge

Multiple Choice

How do we find the charge of an atom with 5 or more Valence Electrons?

• Valence Electrons = Charge

• Valence Electrons - 8 = Charge

• 8 - Valence Electrons = Charge

• 8 = Charge

Fill in the Blank

What is the charge of Aluminum (Al)? Remember to include the + or - after the number.

Fill in the Blank

What is the charge of Oxygen (O)? Remember to include the + or - after the number.

Multiple Choice

Can Al₂O₃ be reduced any further?

• Yes

• No

Multiple Choice

Mg²⁺ and Cl^- create...

• Mg₂Cl
• MgCl₂
• Mg₂Cl₂
• MgCl

Multiple Choice

What is the charge of an atom that has lost one electron?

• -1
• -2
• +1
• +2

Multiple Choice

How many valence electrons does a bromine atom have?

• 1
• 2
• 6
• 7

Multiple Choice

K ⁺  and  N^-3

• KN
• KN₃
• K₃N₃
• K₃N

Multiple Choice

Na ⁺  and  S ^-2

• Na₂S
• NaS₂
• Na₂S₂
• NaS

Multiple Choice

Cations are

• positive
• negative
• on the right side of the periodic table.
• nonmetals

Multiple Choice

The formula of this atom when it becomes an ion would be

• N^-2
• N⁺³
• N^-3
• N⁺²

Multiple Choice

A negatively-charged ion.

• atom
• cation
• anion
• electron

Multiple Choice

Potassium and Sulfur create...

• KS

• KS₂

• K₂S

• K₂S₂

Multiple Choice

Na⁺ and Cl^- create...

• Na₂Cl

• NaCl₂

• Na₂Cl₂

• NaCl

Multiple Choice

Ca²⁺ and N^3- create...

• Ca₂N₃
• Ca₃N₂
• CaN₃
• Ca₂N