What element has 121 electrons and is in the same group as Zinc (Zn)?

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

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