Write a poem about one of the elements (preferably neon or helium):
hydrogen
boron
fluorine
aluminum
chlorine
platinum
arsenic
helium
carbon
neon
silicon
silver
lead
krypton
lithium
nitrogen
sodium
phosphorus
mercury
nickel
tin
berilium
oxygen
magnesium
sulfur
gold
copper
chromium

What is the percentage of hydrogen in c2h4

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron