500 Science
501 Science – Philosophy / Theory
502.82 Microscopes
507 Science – Education / Research
507.8 Science experiments
508 Science – Natural History
508.2 Seasons
509 Science – History / Geographic treatment
509.2 Scientists
520 Astronomy
521 Celestial mechanics (gravity, orbits)
522 Techniques, procedures, apparatus (telescopes etc)
523 Specific celestial bodies (zodiac etc)
523.1 The Universe. Galaxies, quasars
523.2 Planetary systems
523.3 Moon
523.4 Planets
523.5 Meteors
523.6 Comets
523.7 Sun
523.8 Stars (black holes, clusters, pulsars)
523.9 Satellites and rings, eclipses, transits, occultations
525 Earth (Astronomical geography)
530 Physics
530.01 Physics – Philosophy
530.03 Physics - Dictionaries
530.092 Isacc Newton / Albert Einstein
530.1 Theories and mathematical physics
530.11 Relativity
530.12 Quantum mechanics
530.14 Field and wave theories
530.4 States of matter
530.8 Measurement
531 Solid mechanics - Force / Energy / Physics / Motion / Gravitation
532 Liquid motion – waves, buoyancy, flow
533 Air
534 Sound
535 Light
535.3 Light - mirrors
535.5 Light – beams
535.6 Light – colour
536 Heat – expanding, contracting / melting, freezing
537 Electricity / Electronics
537.6 Circuits
538 Magnets / Magnetism
539 Modern physics
539.2 Radiation - Radiant energy / Electromagnetic radiation / Spectrum / Waves
539.7 Atomic and nuclear physics – Protons, Quarks, Radioactivity
540 Chemistry
540.3 Chemistry - Dictionaries
540.92 Physicists - Marie Curie
541 Mixtures (Chemistry) / Chemical Bonds / Chemical Reactions, Elements
546 Inorganic Chemistry
546.2 Hydrogen and its compunds (Deuterium / Tritium / Acids / Hydrogen)
546.3 Metals, their compounds and mixtures / Bases / Salts / Alkali metals - Group 1A - Lithium / Sodium / Potassium / Rubidium / Cesium / Francium / Beryllium / Magnesium / Calcium /Strontium / Barium / Radium
546.4 Group 3B – Scandium / Yttrium / Lanthanum / Cerium / Praseodymium and neodymium / Promethium / Samarium and europium / Gadolinium and terbium / Dysprosium and holmium / Erbium and thulium / Ytterbium and lutetium / Actinide series / Actinium / Thorium / Protactinium / Uranium / Neptunium / Plutonium / Transuranium elements / Americium / Curium / Berkelium / Californium / Other transuranium elements
546.5 Groups 4B, 5B, 6B, 7B – Group 4B - Titanium group / Titanium / Zirconium / Hafnium - Group 5B - Vandium group – Vandium / Nioium / Tantalum - Group 6B - Chromium group – Chromium / Molybdenum / Tungsten - Group 7B - Manganese group – Manganese / Technetium / Rhenium
546.6 Groups 8, 1B, 2B, 3B, 4A – Group 8 - Iron / Cobalt / Nickel / Platinum metals / Ruthenium / Rhodium / Palladium / Osmium / Iridium / Platinum - Group 1B - Copper / Silver / Gold - Group 2B - Zinc / Cadmium / Mercury / Boron / Aluminum / Gallium / Indium / Thallium / Carbon / Silicon / Germanium / Tin / Lead
546.7 Groups 5A, 6A, 7A, O – non-metals – Group 5A - Nitrogen / Phosphorus / Arsenic / Antimony / Bismuth - Group 6A - Oxygen / Sulfer / Selenium / Tellurium / Polonium - Group 7A - Halogens / Fluorine / Chlorine / Bromine / Iodine / Astatine - Group 0 - Noble gases – Helium / Neon / Argon / Krypton / Xenon / Radon
546.8 Periodic table
547 Organic chemistry – polymers, isomers
548 Crystallography
549 Mineralogy