Answer
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Hint: By counting the number of atoms or molecules from which sodium ion is attached, we can find the coordination number of \[N{{a}^{+}}\].
Complete step by step solution:
We know that the Coordination number is also called Ligancy. The number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal is known as coordination number.
Method of finding coordination number:
First identify the central atom in the chemical formula. Usually, this is a transition metal.
Then locate the atom, molecule, or ion nearest the central metal atom.
Add the number of atoms of the nearest atom/molecule/ions.
Find the total number of nearest atoms.
Rock salt is an ionic compound that occurs naturally as white crystal. The rock salt structure is a simple crystal structure of the form AX, it is adopted by sodium chloride. In the case of NaCl, it is a fcc array of anions with the cations inside the octahedral holes.
NaCl has a fcc lattice in which sodium is at all corners and chloride ions are on the face centre. Here, each ion is attached with 6 other ions. So, the coordination number of each ion is 6. Sodium ion is attached with 6 chloride ions at face centers. With a single unit 8 other units are also attached.
So, from the above explanation we can say that the coordination number of sodium ions is ‘6’.
Note: Nearest atoms or ions mean that those ions or atoms should be on the nearest distance. And these ions or atoms can be of similar type or differ.
Complete step by step solution:
We know that the Coordination number is also called Ligancy. The number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal is known as coordination number.
Method of finding coordination number:
First identify the central atom in the chemical formula. Usually, this is a transition metal.
Then locate the atom, molecule, or ion nearest the central metal atom.
Add the number of atoms of the nearest atom/molecule/ions.
Find the total number of nearest atoms.
Rock salt is an ionic compound that occurs naturally as white crystal. The rock salt structure is a simple crystal structure of the form AX, it is adopted by sodium chloride. In the case of NaCl, it is a fcc array of anions with the cations inside the octahedral holes.
NaCl has a fcc lattice in which sodium is at all corners and chloride ions are on the face centre. Here, each ion is attached with 6 other ions. So, the coordination number of each ion is 6. Sodium ion is attached with 6 chloride ions at face centers. With a single unit 8 other units are also attached.
So, from the above explanation we can say that the coordination number of sodium ions is ‘6’.
Note: Nearest atoms or ions mean that those ions or atoms should be on the nearest distance. And these ions or atoms can be of similar type or differ.
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