P2 TOPIC 5

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  • Created by: fadum99
  • Created on: 03-03-14 18:29

ATOMIC NUCLEI & RADIOACTIVITY    PART 1

 

 

ATOMS&IONS: NUCLUES(NEUTRONS AND PROTONS) = MASS NUMBER/NUCLEONS

 

AROUND THE NUCLEUS ARE ELECTRONS. A NEUTRAL ATOM HAS THE SAME NUMBER OF ELECTRONS AND PROTONS.

AN ION IS A CHARGED ATOM THAT HAS GAINED OR LOST ELECTRONS. ADDING ELECTRONS MAKES AN ATOM A NEGATIVE. REMOVING MAKES POSITIVE.

STATIC ELECTRICITY: POSITIVE IONS CAN BE CREATED BY RUBBING INSULATORS TOGETHER AND HEATING GAS.

 

ISOTOPES: OF AN ELEMENT ARE NUCLEI THAT HAVE THE SAME NUMBER OF PROTONS BUT DIFFERENT NUMBER OF NEUTRONS AND SO HAS DIFFERENT MASS

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