SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When it has a complete set of valance electrons
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When it has an incomplete set of valence electrons
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When its overall electromagnetic charge is negative
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When its overall electromagnetic charge is positive
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Detailed explanation-1: -Species with incomplete octets are pretty rare and generally are only found in some beryllium, aluminum, and boron compounds including the boron hydrides.
Detailed explanation-2: -Incomplete octets In some cases, when the procedure for drawing a Lewis structure is followed, the result is a central atom with less than an octet. Such incomplete octets arise for molecules with the Group 2A and 3A elements beryllium and boron, atoms with only a few valence electrons.
Detailed explanation-3: -However, there are three general exceptions to the octet rule: Molecules, such as NO, with an odd number of electrons; Molecules in which one or more atoms possess more than eight electrons, such as SF6; and. Molecules such as BCl3, in which one or more atoms possess less than eight electrons.
Detailed explanation-4: -What elements can be an exception to the octet rule? There aren’t enough electrons in hydrogen, beryllium, or boron to make an octet. There is only one valence electron in hydrogen, and there is only one site for it to make a connection with another atom.