18 results for “hydrogen”
Chemistry
Water: The Strangest Ordinary Substance
hydrogen atoms, which is where the formula H2O comes from. The atoms are not in a straight
Article · 3 min read
Planets & the Solar System
The Sun
hydrogen nuclei, which normally repel each other, are slammed together hard enough to stick. Four hydrogen
Article · 4 min read
Space & the Universe
The Life of a Star
hydrogen in the core runs out, the core contracts and heats, and a shell of hydrogen
Article · 3 min read
Chemistry
Acids and Bases
hydrogen ions when it dissolves in water. A hydrogen ion is simply a hydrogen atom that
Article · 3 min read
Matter, Energy & Physics
The Periodic Table
hydrogen with one to the heaviest known with 118, and that number also fixes how many
Article · 4 min read
Planets & the Solar System
Jupiter
hydrogen is squeezed into a metal, an ocean of liquid metallic hydrogen tens of thousands of kilometres
Article · 3 min read
Matter, Energy & Physics
The Quantum World
hydrogen by proposing that electrons can occupy only certain energy levels in an atom, never the values
Article · 4 min read
Space & the Universe
The Big Bang
hydrogen isotope called deuterium. Then expansion cooled things too much for fusion to continue, and it stopped
Article · 4 min read
Space & the Universe
Nebulae
hydrogen atoms; when the electrons recombine, the atoms emit light at specific colours. Hydrogen's signature
Article · 3 min read
Planets & the Solar System
Saturn
hydrogen and helium with no solid surface. It is noticeably less dense: its average density is lower
Article · 4 min read
Chemistry
The Chemistry of Life
hydrogen, oxygen and nitrogen, plus a little phosphorus and sulphur, and you have almost everything a living
Article · 3 min read
Matter, Energy & Physics
Gravity
hydrogen fuses, so every star shines because of it. It holds the atmosphere to the Earth
Article · 4 min read
Life & Biology
The Origin of Life
hydrogen and carbon dioxide, consistent with a home in hot, mineral-rich water. It was not the first
Article · 4 min read
Matter, Energy & Physics
Atoms
hydrogen; two, helium; six, carbon; eight, oxygen; 26, iron; 79, gold; 92, uranium. There are 94 naturally
Article · 4 min read
Planets & the Solar System
Uranus and Neptune
hydrogen and helium, like the gas giants, but the resemblance ends there. Beneath the clouds, most
Article · 4 min read
The Human Body
The Senses
hydrogen atom. It is also fragile. Hair cells do not regrow, and loud noise destroys them
Article · 4 min read
Chemistry
Chemical Reactions
hydrogen and oxygen atom that went in comes out again; they have only changed partners. This
Article · 3 min read
Planet Earth
Plate Tectonics and Earthquakes
hydrogen bombs and sent a tsunami across the Pacific to Japan. The 2011 Japan earthquake, magnitude
Article · 4 min read
