Periodicity Quiz (After Activity)

The element with the lowest electronegativity in Period 3 is -

• Na

• Cl

• Mg

• Al

Which of the following shows the correct word equation?

• Acid + Base --> Salt + Hydrogen

• Acid + Carbonate --> Salt + Water + Ammonia

• Base + Ammonium salt --> Salt + Water + Ammonia

• Acid + Metal--> Salt + Water

The diagram shows how a property of Period 3 elements varies across the period. What is the property?

• Atomic radius

• Electronegativity

• First ionisation energy

• Melting point

Which one of the following statements is correct?

• The first ionisation energies of the elements in Period 3 show a general decrease from sodium to chlorine.

• The electronegativities of Group 2 elements decrease from magnesium to barium.

• The strength of the intermolecular forces increases from hydrogen fluoride to hydrogen chloride.

• The ability of a halide ion to act as a reducing agent decreases from fluoride to iodide.

What is formed when sodium reacts with water?

• sodium oxide and hydrogen
• sodium hydroxide and hydrogen
• sodium hydroxide and oxygen
• sodium hydroxide and carbon dioxide

What is the symbol equation for the reaction between Potassium and water?

• 2K + 2H₂O → 2KOH + H₂

• 2Na + 2H₂O → 2NaOH + H

• 2K + H₂O → 2KOH + CO₂

• 2Na + 2H₂O → 2NaOH + CO₂

Which products are formed when magnesium reacts with steam?

• Magnesium hydroxide and hydrogen

• Magnesium hydroxide and oxygen

• Magnesium oxide and hydrogen

• Magnesium oxide and oxygen

Which is the formula of the main aluminium-containing species present when aluminium oxide is added to an excess of water?

• [Al(H₂O)₆]³⁺(aq)

• Al(H₂O)₃(OH)₃(s)

• [Al(H₂O)₂(OH)₄]⁻(aq)

• Al₂O₃(s)

Which element forms an ionic oxide that reacts with strong alkalis?

• Aluminium

• Magnesium

• Sodium

• Sulfur

Which is the correct order of melting points of these Period 3 elements?

• phosphorus > sulfur > chlorine > argon

• argon > chlorine > phosphorus > sulfur

• sulfur > phosphorus > chlorine > argon

• chlorine > phosphorus > sulfur > argon