Problem: A portion of a two-dimensional "slab" of NaCl(s) is shown here in which the ions are numbered.Which colored balls must represent sodium ions?

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We have to determine which colored balls represent sodium ions in the given diagram for NaCl.


An ionic compound is made from a cation and an anion.

A cation is formed by the loss of electrons from a neutral atom while an anion is formed by gain of electrons by a neutral atom.

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Problem Details
A portion of a two-dimensional "slab" of NaCl(s) is shown here in which the ions are numbered.

Atoms 1, 3, 5, 7 and 9 are all one element; 2, 4, 6, and 8 are all the same different element.

Which colored balls must represent sodium ions?

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