The properties of the main groups of elements (General)
- The elements in group 1 are known as alkali metals [alkali metals: The alkali metals are the elements in Group 1 of the periodic table. They have one electron in the outer shell.] . They react rapidly (very fast) with water, producing an alkaline solution and hydrogen gas. The metals become more reactive as you go down the group.
- The elements in group 7 are known as halogens [halogens: The halogens are the elements in Group VII of the periodic table. They have seven electrons in the outer shell.] . Fluorine and chlorine are gases. Bromine is one of only two liquid elements. Iodine is solid. They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group the halogens become less reactive.
- The elements in group 0 are known as noble gases [noble gases: The noble gases are the elements in Group 0/Group VIII of the periodic table. They have a full outer shell of electrons and so are unreactive.] . They are very unreactive and exist as individual atoms (monatomic).
- The transition metals are elements which are found between groups 2 and 3. Well known examples are iron, copper and gold. They are generally quite dense (heavy) and many form brightly coloured compounds.
Now try to answer some questions about the periodic table. Part of the periodic table showing the element symbols is shown below.
Play Elementary and get to grips with the periodic table
Now have a go at Elementary. The three games of Elementary have been designed to help you develop familiarity with the periodic table and the elements in it.
Listen to this audio clip to find out about atoms and the atomic structure.
Now try a Test Bite