Question : How many anions surround a sodium ion in a crystal lattice of sodium chloride?
Option 1: Six
Option 2: Eight
Option 3: Seven
Option 4: Nine
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Correct Answer: Six
Solution : The correct option is 6 .
Every sodium (Na) ion in a sodium chloride (NaCl) crystal lattice has six surrounding chloride (Cl) ions, and every chloride ion has six surrounding sodium ions. This arrangement is a result of the ionic bonding between sodium and chloride ions, and it forms a regular, three-dimensional pattern known as a face-centred cubic lattice. Six sodium ions are pulled to and surrounded by six chloride ions in an energetically favourable and stable configuration, and vice versa.
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