The crystal structure of sodium chloride (naci) is a simple cubic with the na and ci atoms alternating positions. each na atom is then surrounded by \ix ci atoms and likewise each c1 atom is surrounded by six na atoms. (a) sketch the atoms in a (100) plane. (b) assume the atoms arc hard spheres with nearest neighbors touching. the effective radius of na is i .0 a and the effective radius of ci is 1.8 a. determine the lattice constant. (c) calculate the volume dencity of na and c1 atoms. (d) calculate the mass density of nacl.

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)

One similarity and one difference between an element and a mixture of elements