Gap-fill worksheet question Quiz "ATOMIC STRUCTURE and ELEMENTS"

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atom06.gif(1) All substances are made up of basic units called , which are themselves made from three different .

(2) In the centre of an atom is the consisting of charged and neutral .

(3) Moving around the are charged in specific energy levels you can simply envisage as ''.

(4) Particular types of atoms are called and all the atoms of one type have the same number of in the central , which is called the .