Que parts del biodomo contienen carbono

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Who discovered a pattern to the elements in 1869?

What is the equation fort the alkaline zinc/manganese dioxide cell. a) anode b)cathode c)overall equations.