Match the scientists to their contributions to the development of the periodic table. Scientists: Johann Dobhereiner, Henry Moseley, John Newlands, Dmitri Mendeleev

Contributions:

1) proposed a periodic table that accommodated for

the discovery of new elements

2) proposed a triad arrangement based on the elements’

physical and chemical similarities

3) proposed a periodic table based on the repeating properties

of the elements like an octave in music

4) proposed a periodic table based on the increasing order of

the elements’ atomic numbers

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.