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Question
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Solution
The last elements in the periods of the periodic table have their valence shells completely filled with electrons. They are known as noble or inert gases. Their valency is zero.
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The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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