Gr 7 Natural Sciences – Term 2, Topic 4 
                         
                        WORKSHEET A - MEMORANDUM 
                        MATTER AND MATERIALS                        
                        Introduction to the Periodic Table of Elements:  Arrangement of 
                        elements on the Periodic Table 
                         
                       1.  The elements on Periodic Table is divided into 3 groups.  Complete the table:   [6] 
                        CATEGORIES                                 POSITION ARRANGED ON THE PERIODIC TABLE 
                          Metals                   [1]    Left hand s                   ide and in the middle.                        [1] 
                                                                    
                          Non-metals          [1]    Far       ri   ght       -hand s            ide, except Hydrogen which  
                                                                   is on the top left corner.                                       [1] 
                                                                    
                         Semi-metals          [1]    Bet      w   e  e n the           metals and non-metals.                  [1] 
                                                                    
                         
                        2.  How many elements occur in nature?   Ninety / 90                                                                                        [1] 
                        3.  Fill in the labels of the element:                                                                                                      [3] 
                                                                                                  
                        20                                                       Atomic number 
                                                          
                                 Ca                       
                                                                                                   Atomic symbol 
                                                          
                                                          
                                                                                                         Atomic mass 
                        40.078                                          
                         
                        4.  Name one group of metals.                                                                                                               [1]     
                            Lanthanides, actinides, alkaline earths, alkali, basic, transition [any one].  
                        5.  Technetium was the first artificially made element.                                                                                     [1] 
                         
                        6.  The periodic Table of Elements is also known by other names.   
                             Write one other name.                                                                                                                  [1] 
                             Periodic Chart / Periodic Table of the Elements / Periodic Table  
                             of the Chemical Elements [any one]. 
                         
                                                                                                                                                                           
                                           Gr 7 Natural Sciences – Term 2, Topic 4 
                
               7.  The symbol for an element is Cl – answer the following questions about the  
                     element. 
                
                      (a) Is it a metal or non-metal?                                                [1] 
                           
                          Non-metal 
                           
                           
                      (b) What is the group number in which it occurs?                               [1] 
                
                          17 
                
                                                                                [TOTAL   15 Marks]