The element in period 3 with the most metallic character is a sodium b alumnium c silicon d phoshorus

What does the process of natural selection involve

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?

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?