SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ni
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He
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In
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Li
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Detailed explanation-1: -Neon (Ne), argon (Ar), and xenon (Xe) have filled outermost shells.
Detailed explanation-2: -Therefore, three elements with filled outermost shell are neon, argon, and krypton.
Detailed explanation-3: -The atom with completely filled outermost shell shows little chemical activity i.e. inert. It has stable octet configuration (8 electrons in outer most shell) so it doesn’t react. So no combing capacity and the valency is zero.
Detailed explanation-4: -Example 4: Helium (with its 2), neon, argon, and krypton (each with 8) have “filled” their outermost shells. They are the so-called inert or “noble” gases.
Detailed explanation-5: -What element has 3 energy levels and a full outer energy shell? Group 18 elements (helium, neon, and argon) have a full outer, or valence, shell.