Question

the metal element in each chemical formula appears to be responsible for the flame colors. so the flame test can be used to detect the presence of certain metal atoms. no matter what form the copper atom is in, whether it is an element (copper wire) or in a compound like copper sulfate or copper nitrate, it always produces a characteristic blue - green flame. the potassium in potassium nitrate, potassium chloride, and potassium sulfate always produces a pinkish flame. what is responsible for the flame color?

Explanation:

The text clearly states that the metal element in each chemical formula is responsible for the flame colors. Examples of copper and potassium producing characteristic flames in different compounds are provided to support this.

Answer:

The metal