Sodium sulfide, Na2S, is a reactive yellow solid, produced when sodium and sulfur react together.
Use of the periodic table is relevant to this question.
How do the ionic radius and atomic radius of sodium compare with those of sulfur?
|
Ionic radius |
Atomic radius |
|
|
A B C D |
Sodium < Sulfur Sodium < Sulfur Sodium > Sulfur Sodium > Sulfur |
Sodium < Sulfur Sodium > Sulfur Sodium > Sulfur Sodium < Sulfur |
Did this page help you?
The trends in three physical properties of the elements of period 3 are shown in the graphs.
Which physical property is not illustrated?
Electrical conductivity
Atomic radius
Melting point
First ionisation energy
Did this page help you?
Use of the periodic table is relevant to this question.
Which graph correctly shows the Electronegativity of the elements Na, Mg, Al and Si, from period 3, plotted against their first ionisation energies?
Did this page help you?
Consecutive elements X, Y and Z, are in the third period of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of these three elements.
What could be the identities of X, Y and Z?
Silicon, Phosphorus, Sulfur
Sodium, Magnesium, Aluminium
Aluminium, Silicon, Phosphorus
Magnesium, Aluminium, Silicon
Did this page help you?
A table of four substances and their physical properties is shown.
|
Electrical conductivity of aqueous solution |
Electrical conductivity of molten substance |
Electrical conductivity of solid |
Melting point / °C |
Boiling point / °C |
|
|
SiO2 NaCl Al SO3 |
Insoluble Insoluble Good Good |
Poor Good Good Poor |
Poor Good Good Poor |
1610 801 100 -72 |
2230 1465 340 -10 |
Which substances have the correct properties?
SiO2 and Al
NaCl and Al
SiO2 and SO3
All
Did this page help you?
Which of the following metals would have the highest melting point?
Na
Mg
K
Al
Did this page help you?
A student investigated the chloride of a Period 3 element. Below is a cutting from their lab book describing experiments and observations.
| The compound was a white crystalline solid. It dissolved easily in water to give a solution of pH 12. When placed in a test-tube and heated in a roaring Bunsen flame, the compound melted after several minutes of heating. |
What can be deduced from this record?
At least one of the recorded observations is incorrect.
The compound was sodium chloride, NaCl.
The compound was silicon tetrachloride, SiCl4.
The compound was phosphorus pentachloride, PCl5.
Did this page help you?
Use of the periodic table is relevant to this question.
Sir Humphrey Davy discovered the elements magnesium, boron, sodium and calcium.
Which of the elements Sir Davy discovered has the third lowest first ionisation energy in its period and the third smallest atomic radius in its group?
Magnesium
Boron
Sodium
Calcium
Did this page help you?
Which row describes a ceramic material?
|
Conductivity of solid |
Boiling point / K |
Melting point / K |
|
|
A B C D |
None Good Good None |
352 1380 2943 3873 |
156 922 2130 3125 |
Did this page help you?