What element on the periodic table has a mass number of 155 and 99 for the number of electrons

Look at the bean data from days 4–6. use these data to explain how natural selection changed the number of dark red walking beans over time. writing part

Type the letter that represents the correct location for each particle type below.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?