How many atoms of oxygen are in 15.5 g of Sio2?

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

Choose all the answers that apply. as ocean depth increases, temperature decreases temperature increases pressure increases pressure decreases salinity increases density increases

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