Facts about Atoms
- 09
Quantum tunneling allows electrons to pass through energy barriers they classically shouldn't overcome, enabling nuclear fusion in stars and radioactive decay in unstable atoms.
- 08
Atoms with 118 protons form oganesson, the heaviest synthetic element discovered, which decays in milliseconds and was first created in 2006 by Russian and American scientists.
- 07
In 1913, Niels Bohr proposed that electrons occupy specific energy levels around the nucleus, with electrons in lower orbits requiring 13.6 electron volts to escape a hydrogen atom completely.
- 06
Isotopes of the same element contain identical numbers of protons but differing numbers of neutrons, causing uranium-235 and uranium-238 to have different atomic masses and nuclear stability.
- 05
Protons and neutrons in an atom's nucleus weigh approximately 1,836 times more than electrons, making the nucleus responsible for nearly all atomic mass despite being extraordinarily compact.
- 04
Carbon-12 atoms contain exactly 6 protons, 6 neutrons, and 6 electrons, making this isotope the standard reference for measuring atomic mass units across all elements.
- 03
Most of an atom's mass resides in its nucleus, which comprises roughly 99.9 percent of the atom's total mass despite occupying less than 0.0001 percent of its volume.
- 02
Electrons orbiting an atom's nucleus travel at approximately 2,200 kilometers per second, or roughly 1.5 percent of light's speed.
- 01
The nucleus of a hydrogen atom is 100,000 times smaller than the atom itself, with the nucleus measuring roughly 1.75 femtometers in diameter.