1.1 Atoms, Elements and Compounds
Atoms consist of a nucleus surrounded by electrons. Each element is made of one type of atom
Atoms are represented by chemical symbols e.g. calcium is Ca.
Elements in the periodic table are arranged in columns, called groups-the elements in a group usually have similar properties. Main Groups Are:
· Alkali Metals Alkaline Earth Metals
· Transition Metals Other Metals
· Metalloids Other Non-Metals
· Halogens The Noble Gases
COMPOUNDS contain more than one element combined together.