- Why are multiple bonding theories necessary? Valence Bond Theory VESPR Molecular Orbital?

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What are Keck observatories lasers for? How to solve this 2nd order differential equation x²(d²y/dx²)+4x(dy/dx)+2y=ln x, x>0
using substitution x=e^u? How can protein precipitate be contaminated with other proteins? How many square centimeters of galvanized iron are needed to make a 1 metre length of 20cm stopepiped? allow 6cm for the seam? You see an advertisement for an atomic clock. You also known that radioactive decay emits harmful radiation.?