Charges of Elements

Use the periodic table or polyatomic ion list to match the atom(s) with their charge.

• 2–

• Na

• 1+

• O

• 1–

• NO₃

• 2+

• Mg

• 3–

• N

Tags

NGSS.HS-PS1-1

Use the periodic table or polyatomic ion list to match the atom(s) with their charge.

• 1+

• H

• 3–

• Ca

• 2+

• SO₄^2–

• 1–

• P

• 2–

• F

Tags

NGSS.HS-PS1-1

Use the periodic table or polyatomic ion list to match the atom(s) with their charge.

• 2+

• CO₃

• 1+

• Br

• 2–

• Mg

• 3–

• N

• 1–

• K

Tags

NGSS.HS-PS1-1

What is the charge of Fe in Fe₂O₃?

Hint: use the periodic table to determine the charge of oxygen.

• +1

• +2

• –1

• –2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the charge of Cu in CuSO₄?

Hint: use the polyatomic ion list to determine the charge of SO₄.

• +1

• +2

• –1

• –2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A student tried to predict the products for the following reaction.

Why is the following reaction equation incorrect?

1 H₂O --> 1 H₂ + 1 O

• because oxygen is a diatomic element (O₂)

• because the equation is not balanced

• because this is not a decomposition reaction

• because H₂O does not have a neutral charge

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A student tried to predict the products for the following reaction.

Why is the following reaction equation incorrect?

1 Na + 1 Cl₂ --> 1 NaCl₂

• because chlorine is a diatomic element (Cl₂) and should be written as 2 Cl.

• because the equation is not balanced

• because this is not a synthesis reaction

• because NaCl₂ does not have a neutral charge and should be written as NaCl

Tags

NGSS.HS-PS1-2

A student tried to predict the products for the following reaction before balancing

Why is the following reaction equation incorrect?

__ C₆H₁₂ + __ O₂ --> C₆H₁₂O₆

• because the products are CO2 and H2O in a combustion reaction

• because this is not a synthesis reaction

• because NaCl₂ does not have a neutral charge and should be written as NaCl

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7