Answer:
Iodine solid.
Explanation:
a) HCl (l) : it is a liquid so it cannot have a regular geometric pattern.
b) I₂(s) : It is a solid so it can have a regular geometric pattern in it, the molecules will be closely spaced with no translation motion. It will have a fix volume and fix shape.
c) N₂(g) : It is a gas, so molecules will move freely and will have high thermal energy. There will be no fixed shape or pattern of arrangement.
d) NaCl(aq): NaCl solid have a fixed shape and regular geometric pattern, however when it is dissolved in water to form aqueous solution, the ions move freely.
