why elements of group 1 and group 2 show different colours in flame test ?
Answers
Answer:-
★ Ionization energy of group1 and group 2 elements are less in period.
So, on heating with flame the ions in valence shell jumps to excited state.
★ when electrons return back to ground state then they show colours according to their wavelength.
Answer:
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here is your answer...
- Clean a platinum or nichrome (a nickel-chromium alloy) wire by dipping it into concentrated hydrochloric acid and then holding it in a hot Bunsen flame. Repeat this until the wire produces no color in the flame.
- When the wire is clean, moisten it again in the acid and then dip it into a small amount of the solid to be tested so that some sticks to the wire. Place the wire back in the flame.
- If the flame color is weak, it is often helpful to dip the wire back in the acid and put it back into the flame as if cleaning it. This should produce a very short but intense flash of color..
There will, in fact, always be a trace of orange in the flame if you use nichrome. Platinum is much better to use but is much, much more expensive. If you have a particularly dirty bit of nichrome wire, you can just chop the end off. You do not do that with platinum! Dilute hydrochloric acid can be used instead of concentrated acid for safety reasons, but does not always give such intense flame colors...
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