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Numerari from KnowledgeDoor---The scientific calculator with unit keypads, user-defined keys, touchable history, complex numbers, and more!

	Elements Handbook
	Elements Handbook

	Calculators
	Calculators

	The Periodic Table
	The Periodic Table

Elements by Name

Elements by Symbol

Elements by Atomic Number

Group
Labels

	Numerari App
	Numerari App

Learn about its unique features

Help Supplement

	Unit Conversion
	Unit Conversion

Convert to New Units

Convert to Metric Units

Dimensional Analysis:

Compare the Dimensions

Get the Dimensions

Convert to Base Metric Units

Convert an Integer

Convert a Number with a Fractional Part:

Convert a Number with a Non-Repeating Fractional Part

Convert a Number with a Repeating Fractional Part

Convert a Number with a Mixed Fractional Part

Convert a Ratio of Integers

	In the News
	In the News

	Quick Reference
	Quick Reference

Atomic Weight

Oxidation States

Pauling Electronegativity

Electron Configuration

Ionization Energies

Electron Affinity

Allotropes

Density

Molar Volume

Melting Point

Boiling Point

Thermal Conductivity

Atomic Radius

Pyykkö Covalent Radius

Enthalpy of Fusion

Enthalpy of Vaporization

	Atomic Structure
	Atomic Structure

Ionization Energies

Electron Affinity

Electron Binding Energies

Electron Configuration:

Orbital Occupancy

Orbital Filling Order

Term Symbol

Expanded Orbital Occupancy

Effective Nuclear Charge:

Clementi-Raimondi Effective Nuclear Charge

Screening Percentage

Fluorescence Yields

Coster-Kronig Yields

	Thermodynamics
	Thermodynamics

Melting Point

Boiling Point

Thermal Conductivity

Triple Point

Critical Point

Vapor Pressure

Curie Point

Neel Point

Enthalpy of Fusion

Enthalpy of Vaporization

Heat Capacity:

Isobaric Molar Heat Capacity

Isobaric Specific Heat Capacity

Isochoric Molar Heat Capacity

Isochoric Specific Heat Capacity

Electronic Heat Capacity Coefficient

Debye Temperature:

Low Temperature Limit

Room Temperature

	Nomenclature
	Nomenclature

Element Names in Other Languages

Anions or Anionic Substituent Groups

Cations or Cationic Substituent Groups

Ligands

Heteroatomic Anion

'a' Term—Substitutive Nomenclature

'y' Term—Chains and Rings Nomenclature

	Physical Properties
	Physical Properties

Density

Molar Mass

Molar Volume

Physical Form

Linear Thermal Expansion Coefficient

Speed of Sound

Specific Gravity

Elasticity:

Young's Modulus

Poisson's Ratio

Electrical:

Dielectric Constant

Electrical Resistivity

Electron Work Function:

Contact Potential

Photoelectric Work Function

Thermionic Work Function

Superconductivity:

Superconducting Transition Temperature

Superconducting Critical Magnetic Field at Absolute Zero

Superconducting Energy Gap

Hardness:

Mineralogical Hardness

Vickers Hardness

Optical:

Reflectivity

Isothermal Bulk Modulus

Isothermal Compressibility

Gram Atomic Volume

	Crystal Structure
	Crystal Structure

Allotropes

Nearest Neighbor Distance

Atomic Concentration

	Abundances
	Abundances

Geological:

Earth’s Crust

Earth’s Mantle

Earth’s Core

Bulk Earth

Earth’s Atmosphere

Ocean Water

Ocean Sediment

River Water

U.S. Coal

Biological:

Human Body

Human Bone

Human Hair

Human Kidney

Human Liver

Human Muscle

Human Nail

Bacteria

Ferns

Fungi

Astronomical:

Universe

Solar System

Sun

Moon

Meteorites

Halley’s Comet

	Atomic Size
	Atomic Size

Atomic Radius

Orbital Radius

Covalent Radius:

Pyykkö Covalent Radius

Cordero Covalent Radius

Ionic Radius:

Shannon-Prewitt Crystal Radius

Shannon-Prewitt Effective Ionic Radius

Pauling Empirical Crystal Radius

Pauling Univalent Radius

Van Der Waals Radius:

Batsanov Crystallographic Van Der Waals Radius

Batsanov Equilibrium Van Der Waals Radius

Bondi Van Der Waals Radius

Pauling Van Der Waals Radius

Slater Atomic-Ionic Radius

	Atomic Interaction
	Atomic Interaction

Oxidation States

Electronegativity:

Pauling Electronegativity

Mulliken-Jaffe Electronegativity

Sanderson Electronegativity

Allred-Rochow Electronegativity

Configuration Energy

Allen Electronegativity

Allred Electronegativity

Boyd-Edgecombe Electronegativity

Ghosh-Gupta Electronegativity

Nagle Electronegativity

Pearson Absolute Electronegativity

Smith Electronegativity

Free Electron Fermi Surface Parameters:

Electron Concentration

Radius Parameter

Fermi Wavevector

Fermi Velocity

Fermi Energy

Fermi Temperature

Chemical Hardness

Cohesive Energy

	Identification
	Identification

CAS Number

DOT Number

ICSC Number

RTECS Number

UN Number

	History
	History

Discovery

Origin of Element Name

Origin of Element Symbol

Formerly Used or Proposed Element Names and Symbols

U.S. Towns Named After Elements

	Units and Constants Handbook
	Units and Constants Handbook

	General Physics
	General Physics

Mass

Time

Force and Weight

Energy, Work, and Heat

Power and Radiant Flux

Frequency

Wavenumber

Velocity and Speed

Acceleration

Linear Momentum

Pressure and Stress

Angular Velocity and Rotational Frequency

Linear Mass Density

Specific Length

Surface Mass Density

Acoustic Impedance

	Chemistry
	Chemistry

Amount of Substance

Molar Volume

Molar Density

Enzymatic Activity and Catalytic Activity

Molar Electric Charge

	Particle Constants
	Particle Constants

Electron Mass:

electron-mass

electron-mass-energy-equivalent

electron-molar-mass

Proton Mass:

proton-mass

proton-mass-energy-equivalent

proton-molar-mass

Neutron Mass:

neutron-mass

neutron-mass-energy-equivalent

neutron-molar-mass

Elements Handbook

Calculators

The Periodic Table

Elements by Name

Elements by Symbol

Elements by Atomic Number

Numerari App

Unit Conversion

Dimensional Analysis:

Base (Radix) Conversion

Convert a Number with a Fractional Part:

In the News

Quick Reference

Atomic Structure

Electron Configuration:

Effective Nuclear Charge:

Thermodynamics

Heat Capacity:

Debye Temperature:

Nomenclature

Physical Properties

Elasticity:

Electrical:

Electron Work Function:

Superconductivity:

Hardness:

Optical:

Crystal Structure

Abundances

Geological:

Biological:

Astronomical:

Atomic Size