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Periodic Table — Elements 1–36 flashcards

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Hydrogen to krypton: the symbol and atomic number of each of the first 36 elements, with reverse cards for Latin-derived and easily confused symbols, grouped by period.

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Learn deck · part of Periodic table · written against: IUPAC element names through Og (118). Updated 2026-10-10.

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  1. What is the symbol and atomic number of hydrogen?
    H, 1

    The most abundant element in the universe; its name means "water-former" in Greek.
    Period 1
  2. Which element has atomic number 1?
    Hydrogen (H)
    Period 1
  3. What is the symbol and atomic number of helium?
    He, 2

    Named after the Greek helios (sun) because it was spotted in the Sun's spectrum before it was found on Earth.
    Period 1
  4. What is the symbol and atomic number of lithium?
    Li, 3

    The lightest metal of all, and the workhorse of rechargeable batteries.
    Period 2
  5. Which element has atomic number 3?
    Lithium (Li)
    Period 2
  6. What is the symbol and atomic number of beryllium?
    Be, 4

    Named after the mineral beryl, whose gem varieties include emerald and aquamarine.
    Period 2
  7. What is the symbol and atomic number of sodium?
    Na, 11

    The symbol comes from the Latin natrium; sodium plus chlorine gives table salt.
    Period 3
  8. Which element has the symbol Na?
    Sodium (atomic number 11)

    Not N (nitrogen) or Ne (neon): Na is from the Latin natrium.
    Period 3
  9. What is the symbol and atomic number of potassium?
    K, 19

    The symbol comes from the Latin kalium; the English name comes from potash.
    Period 4
  10. Which element has the symbol K?
    Potassium (atomic number 19)

    From the Latin kalium — the English name gives no clue.
    Period 4

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About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • Checked against the IUPAC Periodic Table of the Elements and the Royal Society of Chemistry periodic table (rsc.org); etymologies checked against Encyclopaedia Britannica. All wording original.
  • Also checked against the CIAAW Standard Atomic Weights 2024 table and the CIAAW element pages, the IUPAC Red Book (Nomenclature of Inorganic Chemistry, 2005), PubChem's periodic-table and compound records, the Los Alamos National Laboratory periodic table, NASA's Earth Fact Sheet, NIST's SI redefinition page on the metre, MedlinePlus, Natural Resources Canada and HyperPhysics (reference only; no text copied).

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