| Class | Category | Description | Example Entries |
| Class A | Elements & Pure Matter | Periodic table elements, atomic structures, isotopes. | A01: Hydrogen, A79: Gold |
| Class B | Biochemical Forms | Organic and Inorganic compounds, building blocks of life. | B01: Vitamins, B02: Proteins, B03: Enzymes, B04: Lipids |
| Class C | Physical Laws & Mechanics | Fundamental laws of nature, dynamics, and forces. | C01: Newton’s Laws, C02: Thermodynamics, C03: Aerodynamics |
| Class M | Mathematical Constants | Universal constants and calculation tools. | M01: Pi (π), M02: Phi (Φ), M03: Euler’s Number (e) |
| Class S | Special & Hybrid Projects | Multi-disciplinary entries and specific engineering solutions. | S01: 3D Printing Polymers, S02: Battery Chemistry |
A-1: HYDROGEN (H)
Official Identifiers:
- Symbol: H
- Atomic Number: 1
- CAS Registry Number: [1333-74-0]
- Standard Atomic Weight: 1.008 u
Technical Specifications:
- Electron Configuration: 1s¹
- Oxidation States: +1, -1
- Physical Properties: Under standard conditions, it is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible diatomic gas (H₂).
References & Sources:
- IUPAC Nomenclature of Inorganic Chemistry (Ref No: 2005.1)
- ASCII / Unicode HEX: U+0048 (Latin Capital Letter H)
A-2: HELIUM (He)
Official Identifiers:
- Symbol: He
- Atomic Number: 2
- CAS Registry Number: [7440-59-7]
- Standard Atomic Weight: 4.0026 u
Technical Specifications:
- Electron Configuration: 1s²
- Oxidation States: 0 (Stable as a noble gas)
- Physical Properties: Under standard conditions, it is a colorless, odorless, and tasteless gas. It is the first member of the noble gas group. Its boiling point is the lowest among all elements ($4.22\ K$).
References & Sources:
ASCII / Unicode HEX: U+0048 U+0065 (Latin Capital Letter He)
IUPAC Nomenclature of Inorganic Chemistry (Ref No: 2005.1)
A-3: LITHIUM (Li)
Official Identifiers:
- Symbol: Li
- Atomic Number: 3
- CAS Registry Number: [7439-93-2]
- Standard Atomic Weight: 6.94 u
Technical Specifications:
- Electron Configuration: [He] 2s¹
- Oxidation States: +1
- Physical Properties: Under standard conditions, it is a soft, silvery-white alkali metal. It is the lightest metal and the lightest solid element. Highly reactive and flammable; it must be stored in mineral oil.
References & Sources:
- IUPAC Nomenclature of Inorganic Chemistry (Ref No: 2005.1)
- ASCII / Unicode HEX: U+004C U+0069 (Latin Capital Letter Li)
A-4: BERYLLIUM (Be)
Official Identifiers:
- Symbol: Be
- Atomic Number: 4
- CAS Registry Number: [7440-41-7]
- Standard Atomic Weight: 9.0122 u
Technical Specifications:
- Electron Configuration: [He] 2s²
- Oxidation States: +2
- Physical Properties: Under standard conditions, it is a steel-gray, strong, lightweight, and brittle alkaline earth metal. It has a high melting point and exceptional thermal conductivity.
References & Sources:
- IUPAC Nomenclature of Inorganic Chemistry (Ref No: 2005.1)
- ASCII / Unicode HEX: U+0042 U+0065 (Latin Capital Letter Be)
A-5: BORON (B)
Official Identifiers:
- Symbol: B
- Atomic Number: 5
- CAS Registry Number: [7440-42-8]
- Standard Atomic Weight: 10.81 u
Technical Specifications:
- Electron Configuration: [He] 2s2 2p1
- Oxidation States: +3
- Physical Properties: A metalloid (semimetal). In its crystalline form, it is a brittle, dark, and very hard material. It is a poor conductor of electricity at room temperature but becomes a good conductor at high temperatures.
A-6: CARBON (C)
Official Identifiers:
- Symbol: C
- Atomic Number: 6
- CAS Registry Number: [7440-44-0]
- Standard Atomic Weight: 12.011 u
Technical Specifications:
- Electron Configuration: $[He]\ 2s^2\ 2p^2$
- Oxidation States: +4, +2, -4
- Physical Properties: A nonmetal that can exist in various allotropes (diamond, graphite, fullerenes). It is the fundamental building block of all known life and organic chemistry.
A-7: NITROGEN (N)
Official Identifiers:
- Symbol: N
- Atomic Number: 7
- CAS Registry Number: [7727-37-9]
- Standard Atomic Weight: 14.007 u
Technical Specifications:
- Electron Configuration: $[He]\ 2s^2\ 2p^3$
- Oxidation States: +5, +4, +3, +2, +1, 0, -1, -2, -3
- Physical Properties: Under standard conditions, it is a colorless, odorless, and tasteless diatomic gas ($N_2$). It constitutes about 78% of Earth’s atmosphere.
📄 A-08: OXYGEN (O)
Official Identifiers:
- Symbol: O
- Atomic Number: 8
- CAS Registry Number: [7782-44-7]
- Standard Atomic Weight: 15.999 u
Technical Specifications:
- Electron Configuration: $[He]\ 2s^2\ 2p^4$
- Oxidation States: -2 (Primary), -1
- Physical Properties: A highly reactive nonmetal and an oxidizing agent. Under standard conditions, it is a colorless, odorless, and tasteless diatomic gas ($O_2$).
📄 A-09: FLUORINE (F)
Official Identifiers:
- Symbol: F
- Atomic Number: 9
- CAS Registry Number: [7782-41-4]
- Standard Atomic Weight: 18.998 u
Technical Specifications:
- Electron Configuration: $[He]\ 2s^2\ 2p^5$
- Oxidation States: -1
- Physical Properties: The most electronegative and reactive of all elements. Under standard conditions, it is a pale yellow, highly toxic, and corrosive gas.
📄 A-10: NEON (Ne)
Official Identifiers:
- Symbol: Ne
- Atomic Number: 10
- CAS Registry Number: [7440-01-9]
- Standard Atomic Weight: 20.180 u
Technical Specifications:
- Electron Configuration: $[He]\ 2s^2\ 2p^6$ (or $[Ne]$)
- Oxidation States: 0
- Physical Properties: A chemically inert noble gas. Under standard conditions, it is colorless and odorless. It emits a distinct reddish-orange glow when used in high-voltage discharge tubes (neon lights).
References & Sources (For all):
- IUPAC Nomenclature of Inorganic Chemistry (Ref No: 2005.1)
- Unicode HEX codes vary by symbol (e.g., U+004E for Nitrogen).