1 Hydrogen - H

Hydrogen is the first element with just one proton and an electron and is the most abundant substance in the universe, around 65% of the universe.
It is flammable, colorless and odorless.
It is 14 times lighter then air, being the lightest element.
There are hundreds of minerals with hydrogen in it's composition.
Hydrogen and deuterium can burn at temperatures of more than 1500 C, enough to melt glass.


Hydrogen is used in balloons.
Hydrogen can be used in nuclear fusion; by heating hydrogen at very high temperature, you will get 2 hydrogen atoms fused together as deuterium, which will fused with another atom of deuterium resulting helium, the same way a hydrogen bomb works and fusion on our sun.
Hydrogen can be used as coolant.

Safety
Hydrogen is dangerous because is flammable and can detonate near fire.
Hydrogen is flammable because hydrogen reacts with oxygen resulting H2O and an oxygen atom, which will keep reaction with the next hydrogen atom and so on.
Well known disaster was the Hindenburg disaster, a zeppelin filled with hydrogen exploded when caught fire during an attempt to dock with it's mooring mast at Naval Air Station Lakehurst, killing 36 people.
Deuterium is a hydrogen isotope with 1 proton and 1 neutron and is toxic to humans in high concentrations when ingested.

Making hydrogen gas is easy.
Using water and a method named electrolysis, it will break the water into hydrogen and oxygen gas.
Another way is by reacting hydrochloric acid with zinc. Zinc + Hydrochloric acid -> zinc chloride + Hydrogen

Where to find it:
Sun has a purity of 75% Hydrogen;
Tritium watch: some watches use tritium instead of radium to make the phosphor release light, when the radiation of the tritium element hits the phosphor molecules.
Tritium sticks, green, glowing sticks.
Safety exit sign can have as a light source, tritium, for a continuous light emission.

Minerals: Azurite, Malachite, Emmonsite, Mica, Kuliokite, Turquoise, Yanomamite, Kolbeckite, Goethit, Dioptas, Metatorbernite, Miserite, Betafite, Topaz, Lepidolite, Gypsum

Properties:
Atomic number 1; Atomic Weight 1,008
Phases: gas > liquid > slush > solid > metallic
Gas at 20 °C
Melting point -259 °C
Boiling point -252,87 °C
Density 0.08988 g/L
Crystal structure: hexagonal
Magnetism: diamagnetic
speed of sound in gas 1310 m/s
Abundances: 75% of universe; 75% of sun; 0,15% of earth crust; 11% in oceans; 10% in humans
Isotopes:
H 1 protium - abundance 99,9885% - stable
H 2 deuterium - abundance 0,0115% - stable
H 3 tritium - traces, half-life 12,32 years, decay beta, product helium 3
H4, H5, H5, H6, H6

Deuterium can be combined with oxygen to form heavy water.
A form of water with similar properties but heavier, not with alot.
Deuterium is used in nuclear fission as a moderator to slow neutrons (heavy water) and in nuclear fusion reactions.
Tritium is produced in nuclear reactors and is used to produce hydrogen bombs and radiation source in luminous paints.
Tritium radioluminescence is the use of tritium gas to create visible light.
Tritium emits electrons (beta radiation) and interact with a phosphor material and light will be emitted.
Deuterium is used in nuclear plants to slow down neutrons.

How to make deuterium:
There are 2 easy ways. Electrolysis: 2 metal rods can be placed inside a water container and electricity flow throw them. Hydrogen (protium) will leave the water resulting in hydrogen gases but deuterium is heavier and will stay, and thus making heavy water, D2O.
The second way is by heating water at 100 C at 1 atmosphere. Any water has a small percent of heavy water and because heavy water boils at 101,4 Celsius; if you heat water at exacly 100 C, water will evaporate and heavy water will stay, thus making heavy water.
Making deuterium is now easy, just heat water at more then 101,4 Celsius and deuterium atoms will leave the water in a gase form.