You seem to be missing a word there. I'm going to guess that you're looking for reactive. Metals that grow dull (or are oxidized) on contact with air are more reactive than metals that don't oxidize in air (or do so very slowly).
Most metals react with air. Depending on the metal this process is called tarnishing, corroding, rusting. This may involve the reaction with oxygen, water vapour, sulfur compounds, dissolved carbon dioxide. Oxides, hydroxides, carbonates, sulfates, sulfides may all be formed depending on the metal and the environment. Some metals do NOT lose their lustre. Platinum and gold are examples- which is why they are used in jewellery
Their surface is oxidized.
Oxides
No. None of the Group 1 and Group 2 elements of the periodic table, the alkali and alkali earth metals respectively, stay shiny when exposed to air. They all react with moisture in air, and they tarnish quickly. A number of other metals will not stay shiny, either. Iron can be polished, but it will oxidize (rust) if left in air. Some metals will not react with air or the moisture in it, and some will. The results are mixed in that there are a lot of transition metals (Groups 3 through 12 on the periodic table), and each one would have to be evaluated independently (or with its "group mates") to discover if it would stay shiny. Links are provided to some relevant Wikipedia articles. The links are to the groups of metals, and each element in the Group chart is a hyperlink to that element. It should make it easy to do a quick search of the metals to get a complete answer, if that is what is desired.
Alkali Metals
the fact that it is a metal and has the properties of metals. something being shiny means that it has luster, and luster is a property of metals.
transition metals
metals
Non-metals are not normally shiny.
There are quite a few metals that are shiny including gold. Silver and titanium are also metals that are shiny when polished.
It depends on the element. Some metals have very un-shiny appearences, and some non-metals are very reflective.
They were exposed to and reacted with oxygen in the air.
metals are malleable in nature
1 electron in their outer shell, very reactive and are shiny but they lose their shiny surface when exposed to air.
Yes, it is.
No. None of the Group 1 and Group 2 elements of the periodic table, the alkali and alkali earth metals respectively, stay shiny when exposed to air. They all react with moisture in air, and they tarnish quickly. A number of other metals will not stay shiny, either. Iron can be polished, but it will oxidize (rust) if left in air. Some metals will not react with air or the moisture in it, and some will. The results are mixed in that there are a lot of transition metals (Groups 3 through 12 on the periodic table), and each one would have to be evaluated independently (or with its "group mates") to discover if it would stay shiny. Links are provided to some relevant Wikipedia articles. The links are to the groups of metals, and each element in the Group chart is a hyperlink to that element. It should make it easy to do a quick search of the metals to get a complete answer, if that is what is desired.
Alkali Earth metals are shiny. All metals have a property called luster witch means that they are shiny. All metals are also malleable, ductile, and are good conductors.
You can make almost anything shiny by polishing it.
These are the alkali metals.
Transition metals:)