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Not in the "natural" elements (the first 92), but we know of no limit to the trans-urantic elements.

A2: Some gases were first discovered by their spectrums--the yellow line of helium in the sun was observed long before it was found on earth.

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12y ago
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13y ago

Rubidium was one of them but im not sure about the others.

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12y ago

Yes

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Q: A flame test can be used to identify the presence of certain elements in a compound?
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How presence of certain element is confirmed in distant stars?

The presence of certain elements is certified by spectroscopy.


How the presence of certain element is confirmed in distant stars?

spectral analysis of light of stars help us


Is surgar a compound?

yes because its made of certain elements.


Why is the flame test used?

To identify the presence of certain metal ions, such as sodium and caesium.


What group of early experimenters used symbols to identify certain elements?

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What physical property or properties could you use to identify an ionic compound?

If you notice that a compound is composed only of 1 of certain elements, you can deduct they are ionicly bonded. The 7 chemicals are Hydrogen, Oxygen, Fluorine, Bromine, Iodine, Nitrogen and Chlorine. If you discover a new one contact me at natevd95. Hope this is helpful.


Is an alloy of aluminum has a melting range instead of a melting point is the alloy a compound?

It is a compound. All pure elements have a certain exact melting point.


If a compound is made of two elements that are liquids is it certain that the compound will Be a liquid?

No. Only 2 elements are liquid at room temperature, these are Mercury and Bromine. Mercury(II) bromide or mercuric bromide is the chemical compound composed of mercury and bromine with the formula HgBr₂. This white crystalline solid


What term describes a substance that is made when two or more different atoms bond together in a certain ratio?

When 2 or more elements make a chemical bond giving a new material that material wi be a compound,


Two or more elements that combine as a result of a chemical reaction form?

A compound is formed. The process may require a certain amount of energy (heat) to react, or it may release energy in the form of heat.


Can compound undergo chemical change to become elements how?

Yes. Compounds can undergo chemical changes to become elements. An example would be the following: Zn(s) + CuCl2(aq) ===> ZnCl2(aq) + Cu(s). THe CuCl2 is a compound and it is changed into the element Cu(s) and also into zinc chloride.


How does combining elements into a compound affect their properties?

They will either bind on a mollecular scale to form "solutions", or on a non-mollecular scale to form "mechanical mixtures". Certain properties will cause the mixture to combust, give off gasses, or other things, depending on the elements and the ratios.