Beginning with hydrogen how do the chemical elements form?

explanation:

i think option no d is the correct answer

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

i think slash and

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.