Explain why nitrogen is placed in Group V. Refer to electronic configuration in your answer.
Use Table 5.1 to work out the physical state of tellurium at 650 ^{\circ}C. Give a reason for your answer.
State the colour and physical state of bromine at room temperature and pressure.
Describe what is observed when sodium is added to water.
Finish the word equation for sodium reacting with water: sodium + water → [BLANK] + hydrogen.
Complete the symbol equation for this reaction: Na2CO3 + [BLANK] → Na2SO4 + CO2 + [BLANK].
State the colour change observed when sodium hydroxide is added to water containing thymolphthalein. from [BLANK] to [BLANK].
Complete the sentence about an alkali using one of the words from the list. An alkali is a soluble [BLANK].
Complete the dot-and-cross diagram in Fig. 5.1 for sodium fluoride so that the electronic configuration of each ion and the charge on each ion are shown.