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Chapter 19
vocabulary
| Term | Definition |
|---|---|
| metal | usually have common properties they are good conductors of heat electricity, and all but one are solid at room temperature |
| malleable | means they can be hammered or rolled into sheets. |
| ductile | they can be drawn into wires. |
| metallic bonding | positively charged metallic ions are surrounded by a cloud of electrons. |
| radioactive element | is one in which the nucleus breaks down and gives off particles and energy. |
| transition | are those elements in Group 3 through 12 in the periodic table. |
| nonmetal | are elements tat usually are gases or brittle solids at room temperature. |
| distomic molecule | consists of two atoms of the same element in a covalent bond. |
| salt | if a halogen gains an electron from a metal, an ionic compound. |
| sublimation | the process of a solid changing directly to a vapor without forming a liquid. |
| metalloid | can form ionic and covalent bonds with other elements and cha have metallic and nonmetallic properties. |
| allotropes | are different forms of the same element, have different molecular structures. |
| semiconductor | elements that conduct an electric current under certain conditions |
| transuranium element | Elements having more than 92 protons,the atomic number of uranium. |