MEDIUM
AS and A Level
IMPORTANT
Earn 100
Explain why aluminium has a lower first ionisation energy than magnesium.
Important Questions on Periodicity
MEDIUM
AS and A Level
IMPORTANT
Explain why sulphur has a lower first ionisation energy than phosphorus.
MEDIUM
AS and A Level
IMPORTANT
The first ionisation energies of the p-block elements are given in the table below. Predict the missing value for the first ionisation energy of selenium.
| p-block element of period 4 | Atomic number | First ionisation energy/ |
| gallium | 31 | 577 |
| germanium | 32 | 762 |
| arsenic | 33 | 966 |
| selenium | 34 | |
| bromine | 35 | 1140 |
| krypton | 36 | 1350 |
MEDIUM
AS and A Level
IMPORTANT
Which one of these statements about the periodicity of the Period 3 elements is correct?
MEDIUM
AS and A Level
IMPORTANT
The Group 1 metal lithium reacts in a similar way to sodium. It reacts with oxygen, producing lithium oxide. Write the balanced symbol equation, including state symbols, for this reaction.
MEDIUM
AS and A Level
IMPORTANT
Lithium also reacts with chlorine. Write the balanced symbol equation, including state symbols, for this reaction.
MEDIUM
AS and A Level
IMPORTANT
The Group 2 metal calcium reacts more vigorously with cold water than magnesium does, forming an alkaline solution. Write the balanced symbol equation, including state symbols, for this reaction.
MEDIUM
AS and A Level
IMPORTANT
The solution formed when of calcium react completely with of water is more alkaline than the solution formed when of magnesium react completely with of water. Explain why?
MEDIUM
AS and A Level
IMPORTANT
The element germanium is in Group 14, in Period 4. It is classed as a semimetal or metalloid, as is silicon in Period 3.
Predict the chemical bonding and structure of the element germanium.
