Periodic Table/Chemistry REVIEW Test

Which element is represented by the following electron dot diagram?
     X .

• Carbon
• Calcium
• Potassium
• Neon

Which substance is most likely classified as a colloid?

• soft drink
• fog
• water
• oxygen gas

Atoms of which two elements will form an ionic bond?

• Fe and Co
• N and O
• Na and Cl
• Rb and Al

Which compound will most likely be formed when lithium (Li) and nitrogen (N) are chemically combined?

• LiN
• LiN₃
• Li₃N
• Li₃N₃

Which compound results from covalent bonding?

• CO₂
• MgS
• NaCl
• LiF

Which equation represents a decomposition chemical reaction?

• 2S + 3O₂ → 2SO₃
• 2NaCl → 2Na + Cl₂
• 2K + 2H₂O   → 2KOH + H₂
• Zn + 2HCl →      ZnCl₂ + H₂

Which element has the same number of valence electrons as Krypton (Kr)?

• Neon (Ne)
• Fluorine (F)
• Chlorine (Cl)
• Selenium (Se)

Which statement best describes the atoms of elements that form compounds by covalent bonding?

• they share electrons between them
• they have a large difference in atomic number
• they are in the same period in the periodic table
• they have a large difference in valence electron number

What is the correct name for the compound NaNO₃?

• sodium nitrate
• sodium nitrous acid
• sodium nitrogen oxide
• sodium nitrogen trioxide

How many valence electrons does Lithium have?

• 1
• 2
• 3
• 4