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SCIPAD - BIG IDEAS - BOOK 2
NATURE OF THE ATOM
5. Draw the electron arrangement of the following atoms.
6. Aluminium has an electron configuration of 2,8,3.
(a) How many electrons does aluminium have in its outer shell? 
(b) How many electrons does it need to gain to have a full outer shell? 
(c) How many electrons does it need to lose to have a full outer shell? 
(d) Is it going to be easier for aluminium to gain or lose electrons? 
(e) What will be the charge on the aluminium ion? 
7. Fluorine has an electron configuration of 2,7.
(a) How many electrons does fluorine have in its outer shell? 
(b) How many electrons does it need to gain to have a full outer shell? 
(c) How many electrons does it need to lose to have a full outer shell? 
(d) Is it going to be easier for fluorine to gain or lose electrons? 
(e) What will be the charge on the fluoride ion? 
8. Label the diagrams below as showing either an element, a compound or a mixture.
Be
He C Mg
9. Decide if the following chemical formulae represent an element or compound.
(a) HCl (b) H2SO4
(c) CaCO3 (d) Rb
(e) C (f) Na
10. State the number of atoms in the following compounds.
(a) CaCl2 (b) KMnO4
(c) FeI3 (d) H2O2
(e) HCl (f) HNO3
(a) 				 (b) 				 (c)
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