The Importance of the Predoic Table
The Periodic Table is a chart which arranges the chemical elements in a useful, logical manner. Elements are listed in order of increasing atomic number, lined up so that elements which exhibit similar properties are arranged in the same row or column as each other. Elements are also arranged in different families and periods based on similar characteristics. Also the grouping of elements into into subcategories Metals, Nonmetals, and Metalloids. The Periodic Table is one of the most useful tools of chemistry.
The periodic table on the left separates the elements into three groups the Metals, Nonmetals and Metalloids. Most elements are metals. They are typically shiny, good conductors of heat and electricity, have a high density, and only melt at high temperatures. Metals are ductile and malleable, so their shape can be easily changed into thin wires or sheets. Metals will corrode, gradually wearing away like rusting iron.
Nonmetals, on the right side of the periodic table, are very different compared to Metals. Their surface is dull and they are poor conductor of heat and electricity. As compared to metals, they have low density and will melt at low temperatures. The shape of a nonmetal cannot be changed easily as they tend to be brittle and will break easily.
Elements that have properties of both Metals and Nonmetals are called Metalloids. They can be shiny or dull and their shape is easily changed. Metalloids typically conduct heat and electricity better than Nonmetals but not as well as Metals.
In the Periodic Table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. In each period (horizontal row), the atomic numbers increase from left to right. The periods are numbered 1 through 7 on the left-hand side of the table. Elements that are in the same period have chemical properties that are not all that similar. Consider the first two members of period 3: sodium (Na) and
The periodic table on the left separates the elements into three groups the Metals, Nonmetals and Metalloids. Most elements are metals. They are typically shiny, good conductors of heat and electricity, have a high density, and only melt at high temperatures. Metals are ductile and malleable, so their shape can be easily changed into thin wires or sheets. Metals will corrode, gradually wearing away like rusting iron.
Nonmetals, on the right side of the periodic table, are very different compared to Metals. Their surface is dull and they are poor conductor of heat and electricity. As compared to metals, they have low density and will melt at low temperatures. The shape of a nonmetal cannot be changed easily as they tend to be brittle and will break easily.
Elements that have properties of both Metals and Nonmetals are called Metalloids. They can be shiny or dull and their shape is easily changed. Metalloids typically conduct heat and electricity better than Nonmetals but not as well as Metals.
In the Periodic Table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. In each period (horizontal row), the atomic numbers increase from left to right. The periods are numbered 1 through 7 on the left-hand side of the table. Elements that are in the same period have chemical properties that are not all that similar. Consider the first two members of period 3: sodium (Na) and