Elements and their compounds exhibit similarities and differences based on their respective positions within the Periodic Table.

Considering only the elements in periods 1-3, name the element with the largest atomic radius.

Considering only the elements in periods 1-3, name the element with the largest ionic radius.

Considering only the elements in periods 1-3, name the element with the highest first ionisation energy.

Considering only the elements in periods 1-3, name the element with the largest electronegativity.

Describe what you would observe when magnesium is heated in steam.

Write an equation for the reaction that occurs.

Write an equation for the reaction of sulfur of sulfur(IV) oxide with water.

Suggest the pH of the resulting solution.

This question is about some period 3 elements and their oxides.

Write an equation for the reaction of phosphorus with an excess of oxygen.

Describe a chemical test you could carry out to distinguish between phosphorus oxide and sodium oxide.

Element X forms an amphoteric oxide that has a very high melting point. 

Write the formula of this amphoteric oxide.

State the meaning of the term amphoteric.

Write two equations to show the amphoteric nature of aluminium oxide when it reacts with hydrochloric acid and with sodium hydroxide. 

State symbols are not required.

The question is about the elements of period 3 from sodium to phosphorus. 

Element X forms an oxide that has a very high melting point. This oxide reacts very slowly with water to form a weakly alkaline solution.

Deduce the type of bonding in this oxide of X. 

Identify element X.

Write a balanced symbol equation for the reaction between element X and hydrochloric acid.

Element Y forms an oxide that has a low melting point. This oxide dissolves in water to form an acidic solution.

Deduce the type of bonding in this oxide of Y.

Identify element Y. 

Write an equation for the reaction between this oxide of Y and water.

Element Z forms an oxide that is insoluble in water.

This oxide reacts with hydrochloric acid and with aqueous sodium hydroxide. 

Identify element Z.

Give the formula for this oxide.

Give an equation for the reaction of this oxide with hydrochloric acid.

The melting points of the period 3 oxides from sodium to sulfur are shown in the table below.

Explain, in terms of structure and bonding, why magnesium oxide has a higher melting point than sodium oxide.

Explain, in terms of structure and bonding, why sulfur trioxide has a higher melting point than sulfur dioxide.

Explain why the melting point of SiO₂ is much higher than the melting point of P₄O₁₀.

The elements from sodium to sulur in period 3 all react with oxygen to form oxides.

Describe two observations for the reaction that takes place when sodium is heated in oxygen. 

Write an equation for this reaction.

Describe two observations for the reaction that takes place when phosphorus is heated in oxygen. 

Write an equation for this reaction.

Describe two observations for the reaction that takes place when magneisum is heated in steam.

Write an equation for this reaction.

Explain why sodium oxide and magnesium oxide form alkaline solutions when added to water.

Give the approximate pH values of the resulting solutions formed when sodium oxide and magnesium oxide are added to water. 

Explain your reasoning.

Sulfur dioxide reacts with water to form a weakly acidic solution. 

Ions are formed when sulfur dioxide reacts with water.

Write an equation for this reaction. 

Suggest why sulfur dioxide forms a weakly acidic solution.

Refer to the equation in part a). 

Suggest why silicon dioxide is described as an acidic oxide even though it doesn't dissolve in water. 

Period 3 oxides can exhibit acidic and/or basic properties depending on the identity of the period 3 element.

Write an equation for the reaction of sulfur trioxide with potassium hydroxide solution. 

Write an equation for the reaction of an excess of magnesium oxide with phosphoric acid. 

Write an equation for the reaction of sodium oxide with phosphorus(V) oxide in the absence of water.

Draw the displayed formula of the undissociated acid formed when sulfur dioxide reacts with water.