HYDROGEN
LIFE
DIS
CO APPLICATION
VE
RE
HISTORY
R
1. As Water Creation
2. Clean Unhealthy Unsaturated Fats Oils
Scientists had been producing hydrogen 3. Hydrogen and Fuel Cells
for years before it was recognized as an
element. Written records indicate that
Robert Boyle produced hydrogen gas as 4. Hydrogen as Fuel Replacement
early as 1671 while experimenting with
iron and acids. Hydrogen was first
5. Processed Ammoniac
recognized as a distinct element by Henry
Cavendish in 1766. HENRY CAVENDISH
6. Hydrogen as Fuel Cell in Nuclear
Composed of a single proton and a single
electron, hydrogen is the simplest and
most abundant element in the universe. It
is estimated that 90% of the visible
universe is composed of hydrogen.
Hydrogen is the raw fuel that most stars
PHYSICAL PROPERTIES ELEMENTAL
'burn' to produce energy. The same
process, known as fusion, is being studied At standard temperature and pressure, hydrogen is a nontoxic,
as a possible power source for use on
earth. The sun's supply of hydrogen is
expected to last another 5 billion years.
nonmetallic, odorless, tasteless, colorless, and highly combustible
diatomic gas with the molecular formula H2. Hydrogen is also NUMBER
prevalent on Earth in the form of chemical compounds such as
hydrocarbons and water.
In fact, hydrogen makes up about 75% of the mass
of the universe. It is found in the sun and most
stars. Hydrogen is the simplest and lightest
element on the periodic table of elements. ...
Hydrogen is odorless, colorless, and tasteless;
D FACTS/TRIVIA
LIFE
HELIUM HISTO DI Norman
Pierre Janssen
PHYSICAL PROPERTIES Lockyer
ELEMENTAL NUMBER SC
APPLICATION
OV
D
ER I
A
Helium, the second most abundant
FACTS/TRIVIA
ER G
R
HISTORY
element in the universe, was discovered
on the sun before it was found on the
earth. Pierre-Jules-César Janssen, a S A
French astronomer, noticed a yellow line
in the sun's spectrum while studying a
M
total solar eclipse in 1868. Sir Norman
Lockyer, an English astronomer, realized
that this line, with a wavelength of 587.49
nanometers, could not be produced by
1. Airships
any element known at the time. It was
hypothesized that a new element on the
sun was responsible for this mysterious 2. MRI scanners
yellow emission. This unknown element
was named helium by Lockyer. The hunt
to find helium on earth ended in 1895. Sir
William Ramsay, a Scottish chemist,
3. Deep-sea diving
conducted an experiment with a mineral
containing uranium called clevite. He
exposed the clevite to mineral acids and
collected the gases that were produced.
He then sent a sample of these gases to
two scientists, Lockyer and Sir William
Crookes, who were able to identify the
helium within it. Two Swedish chemists,
Nils Langlet and Per Theodor Cleve,
independently found helium in clevite at
about the same time as Ramsay. Helium is a colorless, odorless, tasteless gas. It
has a number of unusual properties. For
example, it has the lowest boiling point of any
element, -268.9°C (-452.0°F). The boiling point
for a gas is the temperature at which the gas
changes to a liquid.
Helium is a chemical element with the symbol He and
atomic number 2. Helium is a colorless, tasteless and
odorless gas. Helium is the second most common element in
the Universe (after hydrogen), making up around 24% of
