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What (who) is deficient$19555$ - definition
SPECIES THAT VIOLATE THE OCTET RULE BECAUSE THEY HAVE TOO FEW VALENCE ELECTRONS AND SPECIES THAT HAPPEN TO FOLLOW THE OCTET RULE BUT HAVE ELECTRON-ACCEPTOR PROPERTIES, FORMING DONOR-ACCEPTOR CHARGE-TRANSFER SALTS
Electron deficient; Electron-deficient; Electron-deficient compound
Data deficient
IUCN RED LIST CATEGORY
Data Deficient; Data deficient species
A data deficient (DD) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as offering insufficient information for a proper assessment of conservation status to be made. This does not necessarily indicate that the species has not been extensively studied; but it does indicate that little or no information is available on the abundance and distribution of the species.
Deficient number
![Demonstration, with [[Cuisenaire rods]], of the deficiency of the number 8](https://commons.wikimedia.org/wiki/Special:FilePath/Deficient number Cuisenaire rods 8.png?width=200 "Demonstration, with [[Cuisenaire rods]], of the deficiency of the number 8")
NATURAL INTEGER NUMBER FOR WHICH THE SUM OF ITS PROPER STRICT DIVISORS (OTHER THAN ITSELF) IS LESS THAN THE NUMBER ITSELF
Defective number; Deficient numbers
In number theory, a deficient number or defective number is a number n for which the sum of divisors of n is less than 2n. Equivalently, it is a number for which the sum of proper divisors (or aliquot sum) is less than n.
Sotho deficient verbs
Sesotho deficient verbs
In the Sotho language, the deficient verbs are a special subset of Sesotho verbs that require a subordinate or complementary verb to complete their action, and which are used to form many tenses and to impart certain shades of meaning to the predicate. These verbs form part of multi-verbal conjugations comprising a string of verbs (each with its own subjectival concord) and verbal auxiliaries.
Wikipedia
Electron deficiency
Electron deficiency (and electron-deficient) is jargon that is used in two contexts: species that violate the octet rule because they have too few valence electrons and species that happen to follow the octet rule but have electron-acceptor properties, forming donor-acceptor charge-transfer salts.
