Structure of the Atom

Science — First Preparatory

Applications and examples from life

Comparison aspect	Main idea	Keywords
Table salt	it is made of positive sodium ions and negative chloride ions. When salt dissolves in water the ions separate and the solution conducts electricity	madepositivesodiumions
Ions in the body	sodium and potassium ions move across the membranes of nerve cells. This movement allows the nerve impulse to pass from one cell to the next	sodiumpotassiummoveacross
Charging by rubbing	when a plastic ruler is rubbed with wool it gains electrons from the wool and becomes negatively charged. It then attracts small pieces of paper. This shows that charge moves between objects as electrons	plasticrulerrubbedwool

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