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Question
The atom of an element X has 7 electrons in its M shell.
Is it a metal or a non-metal?
Short Note
Solution
Element X is a non-metal because there are 7 electrons in its outermost orbit. In order to complete its octet (to get 8 electrons), it will gain one electron. An element which gains electrons in order to complete its octet is a non-metal.
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Discovery of Charged Particles in Matter - Electrons (e)
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