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 identifying an element based on its light - emission characteristics, the correct phrase is "identifying". "Identifies" is the third - person singular present tense form and is not appropriate here. "To identify" is an infinitive form which is not the correct part - of - speech for this context. "having identified" is a present participle perfect form which is also incorrect in this context.

Answer:

A. identifying