E
Element
AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/391-element
What is Element?
A chemical element is a pure substance that consists of only one type of atom, characterised by the number of protons in its nucleus (atomic number). Elements cannot be broken down into simpler substances by ordinary chemical means. There are 118 confirmed elements, 94 of which occur naturally; they are organised in the periodic table by increasing atomic number.
Key Facts
Term
Element
Index
All "E" terms
Frequently Asked Questions
A chemical element is a pure substance that consists of only one type of atom, characterised by the number of protons in its nucleus (atomic number). Elements cannot be broken down into simpler substances by ordinary chemical means. There are 118 confirmed elements, 94 of which occur naturally; they are organised in the periodic table by increasing atomic number.
More "E" Terms
1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide
C8H18ClN3
2-Ethoxyethanol
C4H10O2
Effective Collisions
Effective Collisions
E ≥ Ea (activation energy required)
Effective Molality
m_eff = i × m (van't Hoff factor)
Effective Nuclear Charge
Z_eff = Z − σ (Slater's rules)
Efflorescence
Hydrated salt losing water in air: M·nH₂O(s) → M·(n-x)H₂O(s) + xH₂O(g)
Einsteinium
Es
Electrical Conductivity
κ = 1/ρ; Λm = κ/c
Electrochemical Cell
Galvanic cell: ΔG = −nFE_cell; Electrolytic cell: ΔG = +nFE_applied
Electrochemical Series
Arranged by E° (standard reduction potential); SHE: E° = 0.00 V
Electrochemistry
E° cell = E° cathode − E° anode | ΔG° = −nFE°
View all "E" terms →
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