Perodic Table

4. It is a gray post-transition metal that is not found free in nature.
7. It is a soft, silvery-white, highly reactive metal. is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates.
9. is silvery and tarnishes black when it is exposed to air, forming thorium dioxide; it is moderately hard, malleable, and has a high melting point.
10. It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element.
12. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps.
13. It is a rare transition metal belonging to the platinum group of the periodic table.
16. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.
17. It is a hard and brittle crystalline solid with a blue-grey metallic lustre; and it is a tetravalent metalloid and semiconductor.
18. It is a rare, silvery-white, hard, corrosion-resistant and chemically inert transition metal. It is a noble metal and a member of the platinum group. It has only one naturally occurring isotope
20. It is a post-transition metal that makes up 0.21 parts per million of the Earth's crust Very soft and malleable.

1. is presumed to be a solid metal, but since only a few atoms of it have been created, it is difficult to study. All of its isotopes have extremely short half-lives.
2. It is a heavy metal that is denser than most common materials.
3. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.
5. t is a silvery-white, soft, nonmagnetic and ductile metal in the boron group.
6. It is commonly known as quicksilver and was formerly named hydrargyrum.
8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
11. is a soft, silvery-white metallic element of the alkali metal group, with a standard atomic weight of 85.4678.
14. With a standard atomic weight of 1.008 is the lightest element on the periodic table. Its monatomic form is the most abundant chemical substance in the Universe
15. It is abundant, multivalent, and nonmetallic.
19. It is a post-transition metal in group 14 of the periodic table of elements. It is obtained chiefly from the mineral cassiterite