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1. Wolfram (W): 3 4220 0C
2. Molybdenum (Mo): 2 623 0C
3. Chromium (Cr): 1 907 0C
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Do elements compounds and mixtures have fix melting and boiling point?
Yes, elements have fixed melting points; but some exceptions are with the elements having allotropes (as carbon, sulfur, phosphorous, etc.) - each allotrope has a specific melting point.
Which of these reasons explains why nonmetallic elements have low melting points?
weak van der waals.....
How does the melting point of elements vary across thegroups?
Melting point trends on the periodic table can be understood in a crude way using the following rule of thumb: The stronger the forces that act between molecules of a substance, the higher the melting point tends to be.The trends are very complex because many different factors influence the forces between atoms (or molecules) in an element. Notice that for each period beyond the first, the melting point rises to a maximum somewhere around the middle of the period and then falls off to a minimum value at the end of the period.The melting points of the first period elements are extremely low, because forces between H2 molecules and between helium atoms are exceptionally weak.In the second period, there is a gradual transition from relatively weak metallic bonding in lithium to strong network covalent bonding in carbon. Nitrogen, oxygen, and fluorine also form strong covalent bonds but they can't form networks of bonds the way carbon does. Atoms of these elements pair up to form diatomic molecules. While the attractive forces within atoms in the diatomic gas molecules is strong, the forces between molecules is very weak. That causes the sharp dropoff in melting point after carbon in the second period.The trend is repeated in a more subdued way in the third period. There is a jump in melting point from aluminum to silicon where bonding changes from primarily metallic to more covalent. P and S are better able to link into chains and rings than their second period counterparts, and have much higher melting points than N2 and O2. In the fourth period, the rise and fall of melting points across the period is even more muted. Note the discontinuity going from gallium (Ga) to germanium (Ge) at the metal/metalloid border.
Which has higher melting point KCl or HCI?
Melting points: KCl: 770oC HCl: -114.22oC
What are the boiling and melting points of bromine?
Boiling point 58.78°C Melting point 7.2°C
Do most transition metals have higher or lower melting points than the representative elements?
Yes, transition metals have higher melting points. This is due to having very strong bonds. This means that a larger amount of energy is needed in order to break them down or bring them to the melting points.
Do amorphous solids have specific melting points?
They have a glass transition.
What is the name given to a row of elements in the periodic table with densities and melting points that change gradually and predictably?
This is a period.
Why do metals share properties with other transition metals in their period?
The physical properties of transition metals are determined by their electron configurations. Most transition metals are hard solids with relatively high melting and boiling points. Differences in properties among transition metals are based on the ability of unpaired d electrons to move into the valence level. The more unpaired electrons in the d sublevel, the greater the hardness and the higher the melting and boiling points.
Do elements compounds and mixtures have fix melting and boiling point?
Yes, elements have fixed melting points; but some exceptions are with the elements having allotropes (as carbon, sulfur, phosphorous, etc.) - each allotrope has a specific melting point.
How high can melting points get?
At 6000K all elements will turn into a gas.there could be hundreds of unknown elements in space so there could be even higher melting points
What is one physical differrence between transition metals and poor metals?
Transition metals tend to have very high melting points.
Are the elements in the boron group high-melting?
It varies. Boron and thallium both have relatively high melting points while gallium and indium have very low melting points.
Do transition have higher melting point than alkaline and alkali metals?
Yes, transition metals generally have higher melting points compared to alkaline and alkali metals. This is because transition metals have a greater number of valence electrons and a stronger metallic bond, which requires more energy to break and transition from solid to liquid. In contrast, alkaline and alkali metals have fewer valence electrons and weaker metallic bonds, resulting in lower melting points.
What is the properties of transition?
They have to properties of metals. Most have high melting and boiling points. They're excellent conductors of electricity.
Do ionic solids have low melting points?
No, ionic solids have very high melting points. Ionic solids are one of the strongest bonds formed among elements.
Name two elements that are side by side on the periodic table that do not reflect the general trend in melting points for the periods?
The Two Element That Are Side By Side by side on the periodic table would be Sr (Strontium) and Y (Yttrium) because they do nit follow trend across the period for melting points.
