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20 February, 14:51

The table shows the total number of electrons in Atom A and Atom B.

Atom Number of Electrons

A 11

B 17

Which statement is correct?

A will give up electrons to form bonds. B will give up electrons to form bonds. Both A and B will be chemically unreactive. Both A and B will gain electrons to become stable.

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  1. 20 February, 17:12
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    A will give up electrons to form bonds.

    Step-by-step explanation:

    The shell configuration of atoms is 2, 8, 8, 18, ...

    Thus, an atom has a filled shell when it has two electrons or ten (2 + 8) electrons or 18 (2 + 8 + 8) electrons.

    A has 11 electrons, one more than necessary for a filled shell. It will give up that electron to reach a filled shell.

    Option B is wrong. B has 17 electrons, one less than is needed for a complete shell. It will gain electrons to reach a filled shell.

    Option C is wrong. Both A and B will be chemically reactive, because each is only one electron short of a complete shell.

    Option D is wrong. Both A and B can't gain electrons. You can't create electrons out of nothing. If one atom gains electrons, another atom must lose them.
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