. Why do you think there are no electronegativity values for the noble gases? 2.

Question

. Why do you think there are no electronegativity values for the noble gases? 2. What are the three most electronegative atoms on the periodic table? 3. What type of bond (covalent or ionic) would you expect to form between an atom with a high electronegativity and an atom of low electronegativity? Explain and give an example. 4. The Periodic table below shows the symbols for the first 20 elements. Fill in the number of valence electrons in the (). IA 8A 7A)He )Li () Be )Na ()Mg 5. You should be able to tell how many valence electrons an atom has by which column of the periodic table the element is in. How many valence electrons are in each of the following atoms? a) bromine b) tin c) krypton d) rubidium

Explanation / Answer

1.

Because all the noble gas elements (Except He) have completely filled octet electronic configuration in their valance shell and hence they are not ready to form chemical bonds with other atoms.

2.

Top three most electronegative elements are,

F 4.0

O 3.5

N 3.0

3.

IONIC BOND

An atom with high electronegativity has a tendency to gain electrons to form a negative ion and an atom with low electronegativity has a tendency to lose electrons to form a positive ion, hence they both form an ionic bond between them.

4.

For all the elements of 1A = 1 valence electron

For all the elements of 2A = 2 valence electrons

For all the elements of 3A = 3 valence electrons

For all the elements of 4A = 4 valence electrons

For all the elements of 5A = 5 valence electrons

For all the elements of 6A = 6 valence electrons

For all the elements of 7A = 7 valence electrons

For all the elements of 8A = 8 valence electrons

5.

Number of velence electrons = group number ( as per old system of gorup numbers)

(a) Bromine is 7A group element has 7 valence electrons

(b) Tin is 4A group element has 4 valence electrons

(c) Kr is 8A group element has 8 valence electrons

(d) Rb is 1A group elements has 1 valance electrons

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