Silver (atomic weight = 108 g mol–1) has a density of 10.5 g cm–3. The number of silver atoms on a surface of area 10–12 m2 can be expressed in scientific notation as y × 10$x$. The value of $x$ is
13
9
7
5
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Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?