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Chemical Elements — Symbols and Facts

Element symbols, atomic numbers, and key properties

P
periodic_patrice 15 terms Nov 18, 2025
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Terms 15

1
H — Hydrogen
Atomic number 1; lightest element; most abundant in the universe
2
He — Helium
Atomic number 2; noble gas; used in balloons and cooling systems
3
C — Carbon
Atomic number 6; basis of organic chemistry; forms diamonds and graphite
4
N — Nitrogen
Atomic number 7; makes up 78% of Earth's atmosphere
5
O — Oxygen
Atomic number 8; essential for respiration; 21% of atmosphere
6
Na — Sodium
Atomic number 11; highly reactive metal; component of table salt (NaCl)
7
Fe — Iron
Atomic number 26; most abundant element in Earth's core; symbol from Latin ferrum
8
Cu — Copper
Atomic number 29; excellent electrical conductor; symbol from Latin cuprum
9
Ag — Silver
Atomic number 47; best electrical conductor; symbol from Latin argentum
10
Au — Gold
Atomic number 79; highly unreactive; symbol from Latin aurum
11
Pb — Lead
Atomic number 82; dense metal; symbol from Latin plumbum
12
Hg — Mercury
Atomic number 80; only metal liquid at room temperature; symbol from Latin hydrargyrum
13
Ca — Calcium
Atomic number 20; essential for bones and teeth; found in chalk and limestone
14
K — Potassium
Atomic number 19; symbol from Latin kalium; critical for nerve function
15
Cl — Chlorine
Atomic number 17; halogen; used in water purification and PVC plastics