# The Periodic Table — Pattern in Matter Canonical URL: https://shipslides.com/d/catalog-science-periodic-table Raw viewer URL: https://content.shipslides.com/d/catalog-science-periodic-table/raw Category: Science Slides: 13 Updated: 2026-05-17T20:55:47.768Z Tags: catalog, science, periodic, table ## Summary For most of history, "elements" meant earth, water, fire, air. The chemical revolution gave that scheme a final shove — and three thinkers laid the groundwork. Key sections include: THE PERIODIC TABLE /; Before the table: scattered clues; Mendeleev arranges the elements; The gaps filled themselves; Moseley fixes the order: atomic number; Periods and groups: rows and columns mean things; Reading an element tile; The colored families of matter; The bottom drawers: f-block exiles; The transuranics: elements made by hand. ## Slide Outline 1. THE PERIODIC TABLE / 2. Before the table: scattered clues 3. Mendeleev arranges the elements 4. The gaps filled themselves 5. Moseley fixes the order: atomic number 6. Periods and groups: rows and columns mean things 7. Reading an element tile 8. The colored families of matter 9. The bottom drawers: f-block exiles 10. The transuranics: elements made by hand 11. Trends across the table: smooth gradients 12. Why the pattern exists: orbitals 13. References & further viewing ## Slide Transcript ### Slide 1: THE PERIODIC TABLE/ - Slide 01 — Opening - 01 / 13 - A Visual History · Element Tiles · Quantum Logic - Pattern in matter — the great organizational triumph of nineteenth-century science. - Hydrogen - 1.008 - Helium - 4.003 - Carbon - 12.011 - Iron - 55.845 - Gold - 196.97 - Uranium - 238.03 ### Slide 2: Before the table: scattered clues - Slide 02 — Pre-History - 02 / 13 - For most of history, "elements" meant earth, water, fire, air. The chemical revolution gave that scheme a final shove — and three thinkers laid the groundwork. - 1789 · Lavoisier - Publishes the first list of true chemical elements (33 of them), defining "element" as a substance that cannot be decomposed. - 1808 · Dalton - Atomic theory: matter is made of discrete atoms, each element a different kind. Atomic weights become a measurable handle. - 1829 · Döbereiner - Notices triads — Cl/Br/I, Li/Na/K, Ca/Sr/Ba — where the middle element's weight is the average of the outer two. A first hint of pattern. - Lithium - 6.94 - Sodium - 22.99 - Potassium - 39.10 - Döbereiner's alkali triad — patterns hidden in the weights. ### Slide 3: Mendeleev arranges the elements - Slide 03 — 1869 - 03 / 13 - In February 1869, Dmitri Mendeleev wrote each known element on a card and shuffled them by atomic weight. He saw chemical properties recur — and made a daring move. - "I saw in a dream a table where all the elements fell into place as required. Awakening, I immediately wrote it down on a piece of paper." - The bold move - Arranged 63 known elements by atomic weight - Grouped them by recurring valence and behavior - Where the pattern broke, he left gaps - Predicted unknown elements with detailed properties - Gaps as predictions - eka-aluminium - eka-silicon - eka-boron - "Eka-" — Sanskrit for "one beyond." Mendeleev predicted weight, density, melting point, and oxide formulas. ### Slide 4: The gaps filled themselves - Slide 04 — Predictions Confirmed - 04 / 13 - Within fifteen years, three of Mendeleev's predicted elements were isolated — and matched his forecasts with uncanny precision. The table went from speculation to law. - Gallium - 69.72 - Germanium - 72.63 - Scandium - 44.96 - 1875 — Boisbaudran isolates gallium (eka-aluminium) - 1879 — Nilson isolates scandium (eka-boron) - 1886 — Winkler isolates germanium (eka-silicon) - Eka-silicon vs. germanium - PropertyPredictedObserved - Atomic weight7272.63 - Density (g/cm³)5.55.32 - Oxide formulaEsO₂GeO₂ - Colorgreygrey-white ### Slide 5: Moseley fixes the order: atomic number - Slide 05 — Modern Table - 05 / 13 - Mendeleev's weight-based ordering had occasional anomalies (Te before I, Co before Ni). In 1913, Henry Moseley used X-ray spectra to show that the true ordering principle was atomic number Z — the count of protons. - X-ray frequency varies as (Z − 1)² — Moseley's law - Z is integer; weight is messy due to isotopes - Reordered table eliminates Mendeleev's exceptions - Predicts exactly four missing elements between H and U - Moseley dies at Gallipoli, 1915, age 27 - A linear plot of √(X-ray frequency) vs. Z — the proton count revealed. ### Slide 6: Periods and groups: rows and columns mean things - Slide 06 — Structure - 06 / 13 - The table's two axes encode physics directly. Read across, you fill an electron shell. Read down, you stack atoms with the same outermost configuration. - Period (row) → shell n - Group (column) → valence - 7 periods — n = 1 through 7, each filling out a new shell - 18 groups — same outer-electron count → same chemistry - Group 1: alkali metals all have a single, eager-to-leave electron - Group 18: noble gases all have a complete, content outer shell ### Slide 7: Reading an element tile - Slide 07 — Anatomy of a Tile - 07 / 13 - Each square encodes four pieces of data. Atomic number top-left fixes identity; symbol declares it; name and atomic mass complete the entry. - Hydrogen - 1.008 - Helium - 4.003 - Carbon - 12.011 - Iron - 55.845 - Gold - 196.97 - Uranium - 238.03 - Atomic number (top-left): proton count, fixes identity - Symbol (center): one or two letters, often Latin in origin (Au = aurum) - Name: place, person, mythology, or property - Atomic mass: weighted average over natural isotopes ### Slide 8: The colored families of matter - Slide 08 — Categories - 08 / 13 - Color-coding the table groups elements that behave alike. Each family has a signature personality — reactivity, conductivity, common compounds. - Alkali metals - Group 1. Soft, silvery, react violently with water. Li, Na, K, Rb, Cs, Fr. - Alkaline earth - Group 2. Harder, less reactive cousins. Be, Mg, Ca, Sr, Ba, Ra. - Transition metals - The d-block. Hard, dense, multi-valent. Iron, copper, gold, platinum. - Metalloids - The staircase: B, Si, Ge, As, Sb, Te. Semi-conducting middle ground. - Halogens - Group 17. Aggressive non-metals. F, Cl, Br, I, At. Form salts. - Noble gases - Group 18. Full outer shell, almost inert. He, Ne, Ar, Kr, Xe, Rn. ### Slide 9: The bottom drawers: f-block exiles - Slide 09 — Bottom Drawers - 09 / 13 - Two rows are conventionally drawn separately so the table fits on a page. The lanthanides and actinides fill 4f and 5f orbitals — long, similar, often confused. - Lanthanides (57–71) - Once called "rare earths." Not actually rare, but chemically near-identical and hard to separate. Ce, Nd, Eu, Gd, Tb, Dy power magnets, lasers, and phosphors in every screen you own. - Lanthanum - 138.91 - Neodymium - 144.24 - Erbium - 167.26 - Actinides (89–103) - All radioactive. Thorium and uranium occur naturally; the rest are produced in reactors and accelerators. Plutonium is the workhorse of fission weapons and reactors alike. - Thorium - 232.04 - Uranium - 238.03 - Plutonium - 244 ### Slide 10: The transuranics: elements made by hand - Slide 10 — Synthesized Elements - 10 / 13 - Past uranium (Z = 92), elements don't exist on Earth — they're forged in cyclotrons by smashing nuclei together. The seventh row was completed in 2016 with element 118, oganesson. - Inline SVG: simplified periodic-table grid with the seven complete periods. ### Slide 11: Trends across the table: smooth gradients - Slide 11 — Periodic Trends - 11 / 13 - The table isn't just a catalog — it's a topographic map. Three properties in particular vary smoothly with position, and predict how elements bond. - Atomic radius - Decreases left → right (more protons pull inward). Increases top → bottom (extra shells). - Ionization energy - Energy to strip an electron. Rises across a period; falls down a group. Noble gases at the peaks. - Electronegativity - Pull on shared electrons. Fluorine 4.0 wins; cesium 0.79 loses. Pauling's scale. ### Slide 12: Why the pattern exists: orbitals - Slide 12 — Why It Works - 12 / 13 - Mendeleev didn't know it, but the rows and columns are dictated by quantum mechanics. Electrons fill orbitals — s, p, d, f — in a fixed order. The capacity of each orbital sets the width of each block. - s2 e⁻ - p6 e⁻ - d10 e⁻ - f14 e⁻ - Block widths = orbital capacities - s-block (2 cols): groups 1–2 + helium - p-block (6 cols): groups 13–18 - d-block (10 cols): transition metals - f-block (14 cols): lanthanides + actinides - The Pauli principle - No two electrons can share all four quantum numbers. Combined with the Aufbau principle (lowest energy first), this fixes the filling order — and so the table's exact shape. - "The table is not a convention. It is a consequence of the Schrödinger equation." ### Slide 13: References & further viewing - Slide 13 — Closing - 13 / 13 - From a deck of paper cards to a quantum-mechanical theorem: the periodic table remains chemistry's most successful predictive instrument. - Selected reading - Eric Scerri — The Periodic Table: Its Story and Its Significance (Oxford, 2007). - Sam Kean — The Disappearing Spoon. Element-by-element narrative. - IUPAC Periodic Table — current authoritative version (iupac.org). - Royal Society of Chemistry — interactive periodic table at rsc.org. - Watch - History of the Periodic Table - Mendeleev's Element Predictions - — end of deck — ## Related Decks - [CLIMATE / Earth's thermostat in motion](https://shipslides.com/d/catalog-science-climate) - [Cosmology / 13.8 billion years, briefly](https://shipslides.com/d/catalog-science-cosmology) - [Ecology / Webs of Dependence](https://shipslides.com/d/catalog-science-ecology) - [On the Origin of Species — A Field Notebook](https://shipslides.com/d/catalog-science-evolution)