The atom symbol is ⚛, U+269B, in Unicode since version 4.1. With U+FE0F after it, it is the atom emoji ⚛️, from Emoji 1.0; with U+FE0E, the same sign as plain text.
Read the full guide
What an atom is
By Wiktionary an atom is the smallest amount of matter that still keeps its identity as a chemical element: a nucleus surrounded by electrons. The word comes from the Ancient Greek for indivisible, built from not and to cut. Wikipedia’s table of the symbol block links ⚛ to the Rutherford model, the idea that atoms have a compact nucleus.
Protons, neutrons and electrons
By Wikipedia the nucleus holds protons and generally neutrons, and the elements differ by their number of protons. Hydrogen is the short one, a single proton and a single electron, typed here as (+) . (-).
Questions and answers
What does the ⚛️ emoji mean?
Unicode’s own note for the character is nuclear installation (on maps). In the emoji list it is a Symbol, in the subgroup named religion, and CLDR, Unicode’s list of search words, gives it three: atom, symbol and atheist. No other emoji is filed under atom.
Is there an Alt code for the atom symbol on a keyboard?
By Wikipedia some apps take the decimal number on the number pad: Alt+9883 gives ⚛, since 269B is 9,883 in decimal. Others turn 269B into ⚛ when Alt+X follows it. Code page 437, which the old Alt codes follow, has no atom.
Is there an atom emoticon to type?
No standard one, so this page types its own with plain keys: -=(o)=- is a nucleus with an orbit drawn through it, and ((o)) is a nucleus inside two shells.
All 64 items
Atom and science 12
⚗️AlembicU+2697 U+FE0F. Unicode notes it as chemical term, chemistry. Filed under chemistry. Emoji 1.0.
⚛️Atom symbolU+269B U+FE0F. Unicode notes it as nuclear installation (on maps). Filed under atom, symbol and atheist. Emoji 1.0.
⚛︎Atom symbol, text styleU+269B. The same character with the text selector, U+FE0E, which asks for a plain symbol. In Unicode since version 4.1.
🧬DNAU+1F9EC. Filed under gene and genetics. Emoji 11.0.
⚡High voltageU+26A1. Filed under electric and electricity. Emoji 0.6.
🥼Lab coatU+1F97C. Filed under scientist, lab and experiment. Emoji 11.0.
🧲MagnetU+1F9F2. Filed under positive, negative and attraction. Emoji 11.0.
🔬MicroscopeU+1F52C. Filed under science and lab. Emoji 1.0.
☢️RadioactiveU+2622 U+FE0F. Filed under radioactive and sign. Emoji 1.0.
🧑🔬ScientistU+1F9D1 U+200D U+1F52C. Filed under physicist, chemist and scientist. Emoji 12.1.
🔭TelescopeU+1F52D. Filed under science and telescope. Emoji 1.0.
🧪Test tubeU+1F9EA. Filed under science, chemistry and experiment. Emoji 11.0.
Show all 64 items (52 more)
Plain science signs 11
⚗︎Alembic, text styleU+2697. The same character with the text selector, U+FE0E.
⌬Benzene ringU+232C. By Wiktionary a benzene ring is six carbon atoms arranged as a ring. In Unicode since version 1.1.
⏣Benzene ring with circleU+23E3. The same ring with a circle inside.
◎BullseyeU+25CE. A stand-in here: a nucleus inside two shells.
⊙Circled dotU+2299. A maths sign. A stand-in here: a nucleus inside one shell.
⊖Circled minusU+2296. A maths sign. A stand-in here for a negative charge.
⊕Circled plusU+2295. A maths sign. A stand-in here for a positive charge.
核Core, Han characterU+6838. A Han character. Unihan defines it as seed, kernel, core, nut; atom.
粒Particle, Han characterU+7C92. A Han character. Unihan defines it as grain; small particle.
ℏPlanck constant over two piU+210F. Unicode notes it as reduced Planck constant, Dirac constant. A quantum physics sign.
☢︎Radioactive sign, text styleU+2622. The same character with the text selector, U+FE0E.
Atom emoticons 5
(+) . (-)A hydrogen atom: by Wikipedia, a single proton and a single electron. Plain ASCII
((o))A nucleus inside two shells. Plain ASCII
.:(o):.A nucleus in a cloud of dots. Plain ASCII
-=(o)=-A nucleus with an orbit drawn through it. Plain ASCII
<(o)>A nucleus between two arcs. Plain ASCII
Atom drawings 2
Atom, drawnSeven lines of ASCII: a nucleus, one shell and two electrons
Two shells, drawnSix lines of ASCII
Science lines 8
⚛️ Lab partner wantedFor the class chat
⚛️ Made of atoms, like everything elseFor a bio
⚛️ Physics homework. Back in ___Fill in the blank
⚛️ Positive, like a protonFor a bio
⚛️ Revising tonight: atoms and ___Fill in the blank
⚛️ Science club, room ___Fill in the blank
⚛️ Science fair: stand ___Fill in the blank
⚛️ Thinking small todayFor a status
Parts of an atom 8
Atom smasher ⚛️By Wiktionary, informal: a particle accelerator
Electron (-)By Wiktionary: the negatively charged subatomic particle that orbits the nucleus
Ion ⚛️By Wiktionary: an electrically charged atom or group of atoms
Isotope ⚛️By Wiktionary: forms of an element whose atoms share a proton count but differ in neutron count
Molecule ⚛️⚛️By Wiktionary: atoms, two or more, joined by chemical bonds
Neutron (0)By Wiktionary: a subatomic particle with no charge, found in an atom's nucleus
Nucleus ⚛️By Wiktionary: the heavy core of an atom, positively charged and built of protons and neutrons
Proton (+)By Wiktionary: a subatomic particle with a positive charge, found in an atom's nucleus
Physics sayings 5
⚛️🔗💥Chain reactionBy Wiktionary, figurative: a run of events, each causing or influencing the next. Atom symbol, then link, then collision.
⚛️👥📈Critical massBy Wiktionary, figurative: the fewest people it takes to set off a phenomenon. Atom symbol, then busts in silhouette, then chart increasing.
⚛️⌛Half-lifeBy Wiktionary: how long an idea or fashion takes to lose half its influence. Atom symbol, then hourglass done.
⚛️✅Not an atom of doubtBy Wiktionary an atom is also a very small amount; a whit. Atom symbol, then check mark button.
⚛️🚀Quantum leapBy Wiktionary, figurative: an abrupt, extreme change. Atom symbol, then rocket.
Atom combos 13
⚛️🕰️Atomic clockAtom symbol, then mantelpiece clock.
⚛️🔭🌌Atoms and starsAtom symbol, then telescope, then milky way.
⚛️⚗️🧪Chemistry setAtom symbol, then alembic, then test tube.
⚛️🧪🥼Lab sessionAtom symbol, then test tube, then lab coat.
⚛️💡Lightbulb momentAtom symbol, then light bulb.
⚛️🧲MagnetismAtom symbol, then magnet.
🧑🔬⚛️PhysicistScientist, then atom symbol.
⚛️📚Physics classAtom symbol, then books.
⚛️📝Physics examAtom symbol, then memo.
⚛️⚡🏭Power stationAtom symbol, then high voltage, then factory.