Answer:
The Black square are considered as the<u> lattice points (Atoms)</u>
= lattice point
Since there is<u> regular arrangement of atoms</u> , therefore it is considered as the ionic solid.
Explanation:
Consider the following points :
<u>Ionic Solids</u> : <em>Those solids which are formed by continuous arrangement of cations(positive charge) and anions(negative charge) bounded by strong force of attraction are called ionic solids.</em>
When These cations and anions arrange regularly in space, they form<u> Crystal Lattice.</u>
<em><u>Crystal Lattice :</u></em><em><u> </u></em><em> A regular 3-D arrangement if the points in space </em>.
<u>Here the whole figure is Crystal Lattice.</u>
<u>Lattice Points </u><em><u>: </u></em><em>Each Point in the lattice is called lattice point.</em>
<em>One lattice point represent one Particle , it can be the atom , the molecue or the ions</em> .
In ionic solid these lattice points are ions
= Lattice Points = ions
These lattice points are joined by a straight line to bring out the Geometry of the Lattice.
So In the given figure :
= Ions
The figure as whole = Crystal lattice
And also known as Ionic Solid
Hence these ties can be considered as the model of ionic solids.