If an atom becomes an ion with a 2+ charge, what does that mean?

• It has lost 2 electrons
• It has gained 2 electrons
• The atom is in period 2
• The atom has an atomic # of 2

Tags

NGSS.HS-PS1-1

How do the following two elements bond together?
Cr³⁺  O^2-         

• CrO
• Cr₃O₂
• Cr₂O₃
• CrO₃

Tags

NGSS.MS-PS1-1

How do the following two elements bond together?
K¹⁺  S^2- 

• KS
• K₈S
• K₆S₃
• K₂S

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the formula for magnesium chloride?

• MgCl
• Mg₂Cl
• MgCl₂
• Mg(ClO₃)₂

Tags

NGSS.MS-PS1-1

What is the formula for copper(I) sulfate?

• Cu(SO₃)
• Cu(SO₄)
• Cu₂(SO₃)
• Cu₂(SO₄)

Which of these combinations is an ionic compound made of?

• Metal and Metal
• Nonmetal and Nonmetal
• Metal and Nonmetal
• Cation and Cation

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Hydrogen nitrite (nitrous acid)

• H₂NO₃
• HNO₃
• HNO₂
• H₂NO₂

What is the element/ion symbol for Iron(III)?

• Fe
• Fe³⁺
• Fe^3-
• Fe(III)

What is the name of the compound Li(OH)?

• lithium hydrogen oxide
• lithium hydroxide
• lithium hydride
• lithium oxide hydride

Tags

NGSS.MS-PS1-1

The chemical formula for an ionic compound of potassium and oxygen is

• KO.
• K₂O.
• K₂O₂.
• KO₂.