tantalum fluoride
51Scandium — (pronEng|ˈskændiəm) is a chemical element that has the symbol Sc and atomic number 21. A silvery white metal that is always present as compounds, scandium ores occur as rare minerals from Scandinavia and elsewhere, and it is sometimes considered… …
52Silver — This article is about the chemical element. For the color, see Silver (color). For other uses, see Silver (disambiguation). palladium ← silver → cadmium …
53Samarium — promethium ← samarium → europium ↑ Sm ↓ …
54Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re …
55Ununhexium — ununpentium ← ununhexium → ununseptium Po ↑ Uuh ↓ (Uhh) …
56Yellowknife — Infobox Settlement official name = Yellowknife, Northwest Territories native name = Somba K e nickname = motto = Multum In Parvo (Much In Little) imagesize = image caption = Downtown Yellowknife image mapsize = 200px map caption = subdivision… …
57Copper — For other uses, see Copper (disambiguation) …
58Period 2 element — A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the… …
59List of chemistry topics — This page aims to list articles related to chemistry. This is so that those interested in the subject can monitor changes to the pages by clicking on Related Changes in the sidebar and on the bottom of the page.This list is not necessarily… …
60Abundance of the chemical elements — Estimated proportions of matter, dark matter and dark energy in the universe. Only the fraction of the mass and energy in the universe labeled atoms is composed of chemical elements. The abundance of a chemical element measures how relatively… …
