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18 April, 12:56

Q: The sodium atom loses an electron to form a sodium ion (Na+). Which statement is correct with respect to its atomic radius?

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A: The sodium ion has a smaller radius than the atom.

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  1. 18 April, 16:37
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    Yes, sodium ion has a smaller radius than the atom.

    Explnation: sodium ion, Na (1+), is a positive ion, which means that the atom has lost one electron. When the atoms lose electrons, they always become smaller. There are two reasons for this: 1) the electron lost is released from the outer shell (valence shell) and this last shell will become empty, which reduces the radius of the atom; and 2) the repulsion force decreases (because there are less electrons), which makes stronger the atraction from the nucleus.
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