If you like the ChemWiki, please "like" us on facebook, "share" us on Google+, or "tweet" about the project.
The periodic table of elements is one of the ways that scientists keep track of all the known elements.
The Periodic table characterizes the known elements in increasing order of atomic number. It starts on the top right hand corner with Hydrogen and continue from left to right which then repeats in the horizontal row below the last element. This is not just a list of elements it is organized in very different ways like properties and atomic mass. At first glance the periodic table may seem disorganized with only a couple elements on the top row and a block on the last row but it is very specific in the way that they are organized.
Elements themselves can be one of the following metals, nonmetals and metalloids.
Non-metals are the complete opposite so they are:
Metalloids have the properties from both metals and non-metals.
One way that the elements are organized is vertically in groups or families. An example of this is group 8, the noble gases with include Helium, Neon and Argon which has a specific name called alkali metals. Group 1 isn’t the only family with a special name there is group 17 which includes Fluorine and Chlorine, that is called the halogens. When looking at groups, elements at the top are the beginning of the group and the ones at the bottom are the end of the group. The main group elements are the ones in groups 1, 2 and the ones ranging from 13 – 18 and the metals in between 3 and 12 are the transition metals.
Elements are organized in horizontally in periods. There are a total of 7 groups in the periodic table and each vary in how many elements they contain. Period 1 only has two elements, Hydrogen and Helium. Period 2 has eight elements whereas group 6 has the most with the addition of the top section of the block of elements on the bottom of the table called lanthanides. Below them are the actinides which follow the same rules as the lanthanide but in group 7.
The individual elements are represented in their own blocks by stating the atomic number (Z) on the top of the box, in the middle is the elements symbol and on the bottom is the average atomic mass of the element. This information can differ in the type of periodic table you are looking at. Some can include information about the actual chemical name or omit information described above.
Determine whether the following elements are metals, non-metals or metalloids,
Identify the group and period that the following elements are in:
Classify which elements are considered as the main group or transition metals. If they are transition metals, state if they are lanthanides or actinides. The elements are:
Arrange the elements from the lowest to highest group number: nitrogen, fluorine, boron, oxygen and carbon.
Arrange the following elements from the lowest to highest period number: aluminum, polonium, germanium, and antimony.
From looking at the periodic table, information about the following elements:
Boron, carbon, nitrogen, oxygen, fluorine
aluminum, germanium, antimony, and polonium
6. From looking at the periodic table, information about the following elements:
This depends on what period table you use!
An NSF funded Project
By STEMWiki Hyperlibrary