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1. It takes 31.8 hours to ship, that means the Ag quantity will decrease by half 31.8/5.3 = 6 times. So if you need 40 grams, you have to order 40 * 2*2*2*2*2*2 = 2560 g (D)
2. Wavelength (lambda) = Planck's Constant (h)/[Mass (kg) x Speed (m/s)]
3. B (7)
4. 1s2 2s2p6 3s2p6d5 4s1
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