Answer:
The temperature at which the given substance starts to boil is called boiling point.
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Answer:
I believe it's D
Explanation:
they both are worked a lot and it makes the most sense.
.3333333 as a repeating decimal
You can't usually just use a single spectrum line to confirm the identity of an element because there are cases that the emission line id not clearly defined. When the emission line is very weak compared to surrounding noise, in which case the more datapoints you have to build up confidence for the existence of a particular emission spectra, the better.