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Question1) The electrons present in outermost shell are called as valence electron.
Option- ['True', 'False']
Answer: True
Explaination: The electrons present in outermost shell are called as valence electron. Because the electrons in the outermost shell determine the valency of an element
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Question2) The number of hydrogen or halogen atom or double the number of oxygen atom, which combin with one atom of the element is taken as its valency.
Option- ['True', 'False']
Answer: True
Explaination: The number of hydrogen or halogen atom or double the number of oxygen atom, which combin with one atom of the element is taken as its valency. According to the electronic concept of valency, “ the number of electrons which an atom loses or gains or shares with other atom to attain the noble gas configuration is termed as its valency.”
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Question3) In group – The valency increases from top to bottom in a group.
Option- ['True', 'False']
Answer: False
Explaination: In period – The valency first increases then decreases from left to right in a period.
In group – The valency remains constant from top to bottom in a group.
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Question4) The tendency of an element to lose electrons and forms positive ions (cations) is called electropositive or metallic character.
Option- ['True', 'False']
Answer: True
Explaination: The tendency of an element to lose electrons and forms positive ions (cations) is called electropositive or metallic character. The elements having lower ionisation energies have higher tendency to lose electrons, thus they are electropositive or metallic in their behaviour.
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Question5) In group – The electropositive or metallic characters increases from top to bottom in a group.
Option- ['True', 'False']
Answer: True
Explaination: In period – The electropositive or metallic characters decreases from left to right in a period.
In group – The electropositive or metallic characters increases from top to bottom in a group.
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Question6) the tendency of an element to accept electrons to form an anion is called its non metallic or electronegative character.
Option- ['True', 'False']
Answer: True
Explaination: Electro – Negative Or Non – Metallic Characters: the tendency of an element to accept electrons to form an anion is called its non metallic or electronegative character. The elements having high electro – negativity have higher tendency to gain electrons and forms anion
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Question7) In period – The electro – negative or non – metallic characters increases from left to right in a period.
Option- ['True', 'False']
Answer: True
Explaination: In period – The electro – negative or non – metallic characters increases from left to right in a period.
In group – The electro – negative or non – metallic characters decreases from top to bottom in a group.
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Question8) In period – The tendency of an element to lose electrons decreases in a period.
Option- ['True', 'False']
Answer: True
Explaination: In period – The tendency of an element to lose electrons decreases in a period. So the reactivity of metals decreases from left to right in a period.
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Question9) In group – The tendency of an element to lose electrons increases in a period.
Option- ['True', 'False']
Answer: True
Explaination: In group – The tendency of an element to lose electrons increases in a period. So the reactivity of metals increases from top to bottom in a group.
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Question10) In group – The tendency of an element to gain electrons decreases in a group.
Option- ['True', 'False']
Answer: True
Explaination: In group – The tendency of an element to gain electrons decreases in a group. So the reactivity of non – metals increases from top to bottom in a group.
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