Which of the following is not one of the postulates of the kinetic molecular theory for ideal gases?
A. The collisions between particles are elastic.
B. The particles attract and then repel each other.
C. The particle size is very small compared to the space between the particles.
D. The particles are in constant random motion.

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explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.