Question

when the electrons of a chemical element change energy states, they release certain wavelengths of light that are unique to that element. this means that the emission of light with a wavelength of 516.7 nanometers(nm), which falls in the 500 - 570 nm range defining the green portion of the visible spectrum, ____ the element iron as the source of the light. which choice completes the text so that it conforms to the conventions of standard english? a) identifying b) identifies c) to identify d) having identified

Explanation:

In scientific writing, when referring to a process of determining what an element is, the correct form is "identifying". "identifies" is the third - person singular present - tense form and not appropriate here. "to identify" is an infinitive form which doesn't fit the context. "having identified" is a present perfect participle form which is also incorrect for this context.

Answer:

A. identifying