An unknown element, A, is isolated and examined. It is determined that
22% of the sample is composed of
the isotope 22A, 36% of the sample is
the isotope 24A, and the other 42%
of the sample is composed of 27A.
Based on this information, what is the
atomic mass of element A?4. An
unknown element, Z, is isolated and
examined. It is determined that 82%
of the sample is composed of the
isotope 987 while the other 18% of
the sample is composed of 102Z.
Based on this information, what is the
atomic mass of element Z?

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.