His model of the hydrogen atom led to an accurate calculation of the wavelengths of light emitted by an excited hydrogen atom.

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Stage in which a typical star has completely stopped fusion