First 20 Elements: Names & Symbols (Hydrogen to Calcium)

Learn the first 20 elements of the periodic table in order, from hydrogen (H) to calcium (Ca), with their chemical symbols and atomic numbers. The set most chemistry classes ask you to memorise first, for middle school, high school and GCSE/IB chemistry. Free flashcards with spaced repetition, so they stick before your test.

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New to this? Read the study guide Periodic Table of Elements: List of All 118 (Names, Symbols & Atomic Numbers)
Question Answer
Hydrogen (#1)
Symbol: H
Helium (#2)
Symbol: He
Lithium (#3)
Symbol: Li
Beryllium (#4)
Symbol: Be
Boron (#5)
Symbol: B
Carbon (#6)
Symbol: C
Nitrogen (#7)
Symbol: N
Oxygen (#8)
Symbol: O
Fluorine (#9)
Symbol: F
Neon (#10)
Symbol: Ne
Sodium (#11)
Symbol: Na
Magnesium (#12)
Symbol: Mg
Aluminium / Aluminum (#13)
Symbol: Al
Silicon (#14)
Symbol: Si
Phosphorus (#15)
Symbol: P
Sulfur (#16)
Symbol: S
Chlorine (#17)
Symbol: Cl
Argon (#18)
Symbol: Ar
Potassium (#19)
Symbol: K
Calcium (#20)
Symbol: Ca

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