Table of Contents
Why silicon has higher melting point than phosphorus?
This is a giant covalent structure. Lots of energy is required to overcome the strong covalent bonds, so silicon has the highest melting point. Phosphorous (P4 Mr = 124), Sulfur (S8 Mr = 256) and chlorine (Cl2 Mr = 71) all are molecular substances and so are bonded to each other by van der Waal forces.
Why silicon has a very high melting point?
Silicon is a non-metal, and has a giant covalent structure exactly the same as carbon in diamond – hence the high melting point.
Does phosphorus have high melting point?
111.4°F (44.1°C)Phosphorus / Melting point
Why silicon has high boiling point?
Silicon has high melting and boiling points due to its network covalent structure. Melting or boiling silicon requires the breaking of strong covalent bonds. Because of the two different types of bonding in silicon and aluminum, it makes little sense to directly compare the two melting and boiling points.
Why does phosphorus have a low melting point?
Phosphorus exists as P4 molecules, which have fewer electrons in them and so have weaker Van der Waal’s forces. So phosphorus has a lower melting point than sulphur.
Why does silicon have a higher melting point than sulfur?
Covalent bonds are much stronger than Van der Waals forces and so require much more energy to overcome, and this leads to the higher melting point observed in silicon dioxide as melting requires the overcoming of forces between atoms/molecules.
Is phosphorus a low melting point?
Phosphorus, sulfur, chlorine and argon There are are van der Waals’ forces between its atoms. The melting and boiling points of these elements are very low because: van der Waals’ forces are very weak forces of attraction … little energy is needed to overcome them.
Which element has the highest melting point?
Tungsten has the highest melting point, which is equal to 3422 degree Celsius.
Why phosphorus has lower melting point than sulphur?
Which has highest melting point?
The metal with the highest melting point is tungsten, at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as electrical filaments in incandescent lamps.
What 3 elements have the highest melting point?
Tantalum, iridium, platinum, gold, tungsten, hafnium, and silver are heavy metals. The closely packed metallic structures show a high melting point. For example, tungsten is a metal with the highest melting point. So, the filament of a bulb is made from tungsten.
What element has the second highest melting point?
Metal with High Melting Point
- Tungsten is the refractory metal with the highest melting point (3420 °C).
- Rhenium is a silver-white metal with the second highest melting point (3180 °C) after tungsten and has the highest boiling point.
- Molybdenum, just like tungsten, is a refractory metal.
Why S8 has a higher melting point than P4?
Phosphorus has P4 molecules whereas sulphur is S8. Sulphur therefore has a bigger molecule with more electrons and therefore stronger van der Waals forces and a higher melting point.
Which one is the hardest element with highest melting point?
Diamond is the hardest substance it’s melting point would be highest. Hence, option B is correct.
- Give reason. Diamond is covalent , yet is has high melting point. Medium. >
- Which has highest melting point? Easy. >
- Which of the following is the hardest substance? Easy. >
Which has the higher melting point?
Why is phosphorus melting point so low?
Which of the following has the highest melting point?
Diamond is the hardest substance it’s melting point would be highest. Hence, option B is correct.
- Give reason. Diamond is covalent , yet is has high melting point. Medium. >
- Which of the following is the hardest substance? Easy. >
- Which has highest melting point? Easy. >
Which compounds have the highest melting point?
p-dibromobenzene has the highest melting point, as it has the highest symmetry.
Which has highest melting point in periodic table?
Tungsten (W). From metals, tungsten has the highest melting point in periodic table. It is located in d block. 3,422 0C is the melting point of tungsten.
Why does chlorine have a higher melting and boiling point than phosphorus?
The molecules are bigger than phosphorus molecules, and thus the van der Waals attractions are stronger, leading to a higher melting and boiling point. Chlorine: Chlorine, Cl 2, is a much smaller molecule with comparatively weak van der Waals attractions, and thus chlorine will have a lower melting and boiling point than sulfur or phosphorus.
Why do sulfur and phosphorus melt faster than phosphorus?
To melt phosphorus you don’t have to break any covalent bonds – just the much weaker van der Waals forces between the molecules. Sulfur: sulfur consists of S 8 rings of atoms. The molecules are bigger than phosphorus molecules, and so the van der Waals attractions will be stronger, leading to a higher melting and boiling point.
Why does silicon have a higher boiling point than phosphorus?
phosphorus has weak inter molecular forces (vander waals) between molecules,where as silicon has giant structure,so it has strong bonds …..takes more energy to break bonds,so higher bp and mp Q: Why does silicon has higher boiling point than phosphorus?
Why does silicon have a high melting point?
Silicon is a metalloid with a giant covalent structure. Silicon has a very high melting point and boiling point because: all the silicon atoms are held together by strong covalent bonds which need a very large amount of energy to be broken.