Atomic Number 81 (Noun)
Meaning
A soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores.
Classification
Nouns denoting substances.
Examples
- Thallium is a grey post-transition metal that behaves very much like lead but has a more silvery appearance when first exposed to air, but a duller, more tin-like lustre appears once oxidized to thallium(I) oxide, Tl2O, at higher oxidation states as +3, similarities appear on comparison to manganese and aluminium.
- The atomic number 81 is representative of a chemical element or atom with this listed protons within its nucleus.
- The atomic number 81 of a thallium atom indicates that there are 81 protons present inside its nucleus at a given time.
- The atomic weight for chemical elements like those corresponding to the atomic number 81 of thallium can shift marginally with respect to the constituents' unique isotopic compositions that can vary slightly depending on where and how the sample may be mined.
- The specific placement for elements with such atomic characteristics (atomic number 81) under normal temperatures and pressures, define characteristics such as highly toxic rodent and insect poisons such as thallium.