1- Complete the following: by Ei7wPM6x

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									                         Science
        
                     1st Preparatory                         Sheet 1
                                                                  1




A- Complete the following:
1- The nearest inert gas to the element F9 is……..and its atomic number
is……..
2- The chemical bond in magnesium oxide is……., while the bond in
hydrogen molecule is.,……..
3- The outer most energy level in non metal contains ……..,……..
or………electrons
4- The chemical formula of magnesium chloride is……..,while the
chemical formula of potassium chloride is……..
5- The atomic number of an element is12, so its valency is ……. and the
element which its atomic number is 17, its valency is……….
6- When acids decompose in water it produces…….
7- From salts which soluble in water is……, while from salts which
insoluble in water is………
8- On heating a magnesium ribbon it changes to…….

B- What is meant by?
1- Ionic bond
2- Negative ion
3-Atomic group
4- Alkalis
5-Law of conservation of matter
6- Chemical reaction

C-Put ( √ ) or (  ):
1- The non metallic element is a good conductor of electricity (        )
2- Ion is always negatively charged                                (    )
3- Mercury is a liquid metal                                       (    )
4- The outer most energy level of inert gases is filled with 8 electrons
except helium                                                      (    )
5- Each atomic group has its own valency                           (    )
6- Chlorine Cl17, its valency is 7                                 (    )
7- Silver chloride salt insoluble in water                         (    )
8- Acids have a sour taste                                         (    )
9- Magnesium + Oxygen              Magnesium dioxide               (    )
10 Carbon is a good conductor non metal                            (    )


  For any enquiries please call : 0106126120 – 24821180 - 26820800
                           Science
         
                       1st Preparatory                      Sheet 1
                                                                 1




D- Give reason:
1- When an atom gains an electron or more it directly becomes a positive
ion
2- Aluminum atom becomes a positive ion during the chemical reaction
3- Ionic bond is formed between metal atom and non metal atom
4- Inert gases is the most stable elements
5- Number of electrons in magnesium ion and oxygen ion are equal
6- Sodium Na11 is a monovalent atom
7- The chemical formula of table salt is NaCl
8- Acids changes the colour of litmus paper into red
9- Alkalis changes the colour of litmus paper into blue
10- Oxygen O8 is divalent

E- Write the electronic configuration for the following
atoms and conclude its valency:
Ca20 – K19 - Al13 – O8 – Cl17




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