Name the non-metal element in Table 2.1 with the smallest percentage by mass.
Name one element in Table 2.1 that belongs to Period 4 of the Periodic Table.
Name the compound that is formed from Mg$^{2+}$ ions and OH$^-$ ions.
Describe what you see when aqueous sodium hydroxide is added one drop at a time to a solution containing calcium ions, and continue until sodium hydroxide is in excess. observations with dropwise addition of sodium hydroxide observations with excess sodium hydroxide
Name one calcium salt that dissolves in water.
Table 2.2 lists some properties of the Group I metals. Use the data in Table 2.2 to predict potassium's melting point and to state the observations when lithium reacts with water.
State how the density of the Group I elements changes as you go down the group.
Complete the symbol equation for this reaction. $\ldots\,\text{Na} + 2\text{H}_2\text{O} \rightarrow 2\text{NaOH} + \ldots$