Question | Answer |
Periodic law | the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements. |
period | a horizonal row of elements in the periodic table. |
group | a vertical column of elements in the periodic table; elements in a group share chemical properties. |
ion | an atom, radical, or molecule, that has gained or lost one or more electrons and has a negative or positive charge. |
metal | an element that is shiny and that conducts heat and electricity well. |
nonmetal | an element that conducts heat and electricity poorly. |
semiconductor | an element or compound that conducts electric current better than an insulator does but not as well as a conductor does. |
metalloid | semiconductors |
family | a group of elements that have similar characteristics. |
alkali metal | one of the elements of Group 1 of the periodic table. |
alkaline earth metal | one of the elements of Group 2 of periodic table. |
transition metal | one of the metals that can use the inner shell before using the outer shell to bond. |
noble gas (inert gas) | one of the elements of group 18 of the periodic table. |
halogen | one of the elements of group 17 of the periodic table. |
Mendeleev | Russian chemist who was one of the first scientists to design a way of organizing the elements. |
rare earth metals | A group of reactive, often toxic, metal elements, also called lanthanides; a collection of seventeen chemical elements in the periodic table. |
lanthanide series | the rare-earth elements with atomic numbers 57 through 71. |
actinide series | a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium. |
chalcogen | the chemical elements in group 16 of the periodic table; of the periodic table. |