The periodic table is a useful tool for chemists and can also provide useful information during your chemistry exam.
What is the periodic table?
The periodic table is a list of all known elements. For each element, four pieces of information is given (and a key given). This is the element’s name, symbol, atomic number and relative atomic mass. The symbol is always written as a capital letter with a lowercase second letter (if it has one). The atomic number is always the smaller of the two numbers. This is the number of protons and electrons in an atom of this element.
Information on electronic configuration
Group number (column) is the number of electrons in the outer shell of an atom. Period number (row) is the number of electron shells that an atom has. So, for example, boron is in group 3 and period 2 so has 3 electrons in its outer shell and has 2 shells.
Type of bonding in a compound
By drawing a step starting to the left of boron the metal and non-metal atoms can be identified. If the atom is to the left of the step then it is a metal and if an atom is to the right it is a non-metal. The type of bonding that a substance has can be worked out if its name or formula is given. Metallic bonds occur if a substance is made up of metal atoms only, ionic bonds form if a substance is made of metal and non-metal atoms, covalent bonds form if a substance is made of non-metal atoms
You can download the periodic table for your exam using the links below: