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: Pâ Pæ Pè Pé Pœ P- P. P/ P< Pa Pb Pc Pd Pe Pf Ph Pi Pj Pk Pl Pm Pn Po Pp Pr Ps Pt Pu Pv Pw Px Py

Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

protactinium

POS

Noun

HYPHEN

pro=tac=tin=i=um

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WORDNET DICTIONARY

Noun protactinium has 1 sense

protactinium(n = noun.substance) atomic number 91, pa, protoactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead; Array

is a kind of metal, metallic element

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CIDE DICTIONARY

protactinium,

The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest-lived isotope, 231 (T = 32,500 yrs.) Also called brevium, Uranium X2 and UX2. [PJC]

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OXFORD DICTIONARY

protactinium, n. Chem. a radioactive metallic element whose chief isotope yields actinium by decay.

Usage

Symb.: Pa.

Etymology

G (as PROTO-, ACTINIUM)

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