Usually they are metal oxides (that is, compounds of metallic elements and oxygen), but many ceramics (especially advanced ceramics) are compounds of metallic elements and carbon, nitrogen, or sulfur.
The rare-earth metals are neither weak nor especially strong metallic elements, and they do exhibit some modest ductility.
Most solid catalysts are metals or the oxides, sulfides, and halides of metallic elements and of the semimetallic elements boron, aluminum, and silicon.
Besides a modernist table by the architect Pierre Jeanneret, there were several of Prouvé's low-slung chairs and a large Antony bookshelf, with blue and gray metallic elements and sliding doors of diamond-point aluminum.
Axel Fredrik Cronstedt, (born Dec. 23, 1722, Turinge, Sweden died Aug. 19, 1765, Säter), Swedish mineralogist and chemist noted for his work on the chemistry of metallic elements and for his efforts to establish a new mineralogical system.
Exogenetic gold can also exist as oxidized ore bodies that have formed under a process called secondary enrichment, in which other metallic elements and sulfides are gradually leached away, leaving behind gold and insoluble oxide minerals as surface deposits.
Now, to explain this and to understand just what is going on here, you need to remember that the electronegativity difference between the central sulfur and the peripheral oxygens is not very great compared to the electronegativity difference between aluminum, which is a very electropositive and metallic element, and chlorine, which is a very electronegative halogen.
In particular, pull-out tests of "through-the-thickness" reinforced insert interfaces between metallic element and FRPC body was improved by the factor 4. The shear-strength of the interface between substrate (FRPC body) and insert showed a similar behaviour.
Sodium is a silver white metallic element and found in less quantity in water.
It is a great pity that indium is a rare metallic element and its' abundance in the earth's crust is very low, which leads to the price of ITO becoming more and more expensive [8 10].
Cadmium (Cd) is a rare metallic element and its natural occurrence in the environment is always low (< 1 mg kg−1; World Health Organization [WHO], 1992).
