Grouping elements
The number of protons in an atoms of an elements gives it its atomic number.Scientists arrange elements according to their atomic numbers in a chart known as the periodic table .Although each element is unique,many have similar properties.Those that share certain properties are grouped together.
Alkali metals
The first group of similar elements in the periodic table is known as the alkali metals.These elements,which include sodium and lithium ,are soft and react with water forming alkaline solutions.
sodium gets hot and metals when it reacts with water,producing hydrogen which burns.
Transition metals
Most of the metals we use in everyday life,such as gold,iron and copper are grouped together as transition metals.This group contains metals that can create magnetic fields and are good conductors of heat and electricity.
The mask of the Egyptian Pharaoh Tutankhamen is made of gold , a transition metal
Alkaline earth metals
metals in this group ,which include barium ,calcium,magnesium and radium are highly reactive ,although not quits as reactive as alkali metals.Alkaline earth metals are found in numerous compounds in Earth,s crust,as well as in our bodies.Bones contain calcium.
