MEDIUM
AS and A Level
IMPORTANT
Earn 100
Why does sulphur have a lower melting point than silicon?
Important Questions on Periodicity
MEDIUM
AS and A Level
IMPORTANT
Why does sulphur have a higher melting point than chlorine?
MEDIUM
AS and A Level
IMPORTANT
Why is magnesium a better electrical conductor than phosphorus?
MEDIUM
AS and A Level
IMPORTANT
Why is magnesium a better electrical conductor than sodium?
MEDIUM
AS and A Level
IMPORTANT
What is the general trend in first ionisation energies across Period 3?
MEDIUM
AS and A Level
IMPORTANT
Explain why aluminium has a lower first ionisation energy than magnesium.
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?
