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| Electronegativity Importance & Uses For Chemists |
Electronegativity Importance & Uses For Chemists
Electro-negativity
is important for chemists because it has following usages:
- Electro-negativity is used to predict the reactivity and bond type. The elements having highest value of electro-negativity are more reactive. Such as Fluorine (F) with highest electro-negativity value of 4.0 is the most reactive element of the periodic table.
- Electro-negativity is used to calculate the bond type as follows
- If electro-negativity difference is 1.7 then the bond is 50% covalent and 50% ionic.
- If the electro-negativity difference is greater than 1.7 then the bond is ionic.
- If the electro-negativity difference is less than 1.7 then the bond is covalent.
- If the electro-negativity difference is less than 0.5 then the bond in an atom is non-polar.
- If the electro-negativity difference is greater than 0.5 but less than 1.7 then the bond is polar covalent one.
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The Inertness of Nobel gases.
The Elements form
bonds to complete their outermost shell. Nobel gases have complete outermost
shells therefore they don’t make bonds with other elements, because they don’t
need to complete their outermost shells.
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Why it is necessary to classify the Elements? Explain with reasoning.
Ans: Up till now approximately 118
elements have been discovered. Thus it is difficult to study each and every
element separately. Therefore it is necessary to classify these elements, in
order to study their physical and chemical properties.
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Discuss the importance of groups and periods in the modern periodic table?
Groups show the number of electrons in the last shell of an element, while periods show the total number of shells present in one atom of a element. These both: shells and electrons are extremely important in studying the properties an element.
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