By referring to the periodic table, identify the group and period to which each of the following elements belongs. Then decide whether the element is a metal, nonmetal, or metalloid. (a) Se (b) Cs (c) Fe (d) ...
At first, the periodic table placed the elements in order of increasing atomic mass. What property is now used instead of atomic mass? Why does the periodic table work? Classify each element as an alkali metal, alkaline earth metal, halogen, or noble gas....
aCertain groupings of elements in the periodic table are designated by special names. The heavy, stepped, diagonal line on the table divides the elements into two major classed. Those to the left of the line are called metals, and those to the right, nonmetal. GroupⅠA elements are known...