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Many of them - metals that do not tarnish are the exception - the best known is gold -a so-called noble metal. Some metals that look shiny have in fact got a thin layer of oxide on them e.g. aluminium.
Most of the reactive metals do so as they are more likely to form an oxide layer!!!!
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThis happens because of oxidation. When the metal is in contact with air, the oxygen oxidises it and forms a layer of metal oxide coating which appears to be dull. SO, I guess it can be called oxidation.
Wiki User
∙ 14y agoIt is sodium.
Anonymous
Lead
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Why is it when you cut s piece of sodium metal the shiny metal soon goes dull?
because soduim turns metals dull
Why is a freshly cut piece of sodium's surface shiny?
Sodium in its natural state is shiny, like most metals. When sodium interacts with oxygen in the air, it become sodium oxide, which is much more dull. As a result, when you cut into a piece of sodium, you reveal a brand new part of the sodium that has not yet become sodium oxide and is still shiny.
Is sodium a shiny metal?
Sodium is not a shiny metal to the eye. This is because like many other unstable metals it oxidizes with the air and becomes dull. One example is copper. The statue of liberty is made of this and it is not neither shiny nor brown; it's green! Sodium is very malleable and you can cut it with a knife. Sodium is also very reactive in water. See the related video link below.
What has a high luster or sheen when cut?
Metals
What property describes the elements in group 1?
The most common property between all group 1 elements is the formation of +1 charge when participating in a chemical bond. Other properties include excellent thermal conductivity, extremely soft (maybe even liquid), luster, and relatively low melting points for a metal
What property does all metals share?
They all tend to be shiny. They're not all strong as alkali metals can be cut by a normal knife.
Are alkali metals shiny gray solids soft?
yes if you cut inside it you will see all of this descriptions
Are alkali metals gray?
No, they are not.Sodium might look grey if you are looking at a tarnished surface, but a fresh-cut surface is distinctly yellow. Similarly a fresh-cut surface of potassium has a definite lilac appearance.
Why is it when you cut s piece of sodium metal the shiny metal soon goes dull?
because soduim turns metals dull
Why is a freshly cut piece of sodium's surface shiny?
Sodium in its natural state is shiny, like most metals. When sodium interacts with oxygen in the air, it become sodium oxide, which is much more dull. As a result, when you cut into a piece of sodium, you reveal a brand new part of the sodium that has not yet become sodium oxide and is still shiny.
What is the reactive metal which can be cut by a knife?
Metals that can be cut easily are the alkali metals. They are "soft" metals that can be cut with a knife.
Can alkali metals metals cut with a knife?
Na (Sodium) is an alkali metal that can be cut with a knife.
Which 2 metals that can be cut with a knife?
sodium and potassium are the two metals that can be cut by a knife.
Is carbon luster or dull?
Shiny
Is potassium shiny on the periodic table?
Potassium is an alkali metal.It is shiny when freshly cut but quickly go dull.
What is the luster for the dimond?
A cut diamond is shiny but a raw one is not.
Which metals can be cut with a knife?
Lithium can be cut with a knife because the elements built in it are very sof tand timid.
