Is technetium a metal nonmetal or metalloid?
The color of technetium is silvery-grey and is a crystaline metal. In chemistry it is placed in a group of metal elements named the transition metals. The chemistry of technetium is similar to rhenium and manganese. The isotope 99mTc is used in nuclear medicine.
What type of element is calcium (# 20 )?
alkaline earth metal
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.
What is the density of technetium?
11.5 g.cm-3
| Atomic number | 43 |
|---|---|
| Atomic mass | (99) g.mol -1 |
| Electronegativity according to Pauling | 1.9 |
| Density | 11.5 g.cm-3 at 20°C |
| Melting point | 2200 oC |
Which is the first artificial element?
technetium
In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek τεχνητός, meaning “Craft, Art or Artificial”, + -ium).
What type of metal is platinum?
platinum (Pt), chemical element, the best known and most widely used of the six platinum metals of Groups 8–10, Periods 5 and 6, of the periodic table. A very heavy, precious, silver-white metal, platinum is soft and ductile and has a high melting point and good resistance to corrosion and chemical attack.
Is antimony a metalloid?
Antimony is a chemical element with symbol Sb and atomic number 51. Classified as a metalloid, Antimony is a solid at room temperature.
What is the name of element Co?
cobalt
cobalt (Co), chemical element, ferromagnetic metal of Group 9 (VIIIb) of the periodic table, used especially for heat-resistant and magnetic alloys.
Is calcium a solid liquid or gas?
Calcium is a chemical element with symbol Ca and atomic number 20. Classified as an alkaline earth metal, Calcium is a solid at room temperature.
