What is the particle that is labeled with a question mark in the diagram? beta particle quark isotope alpha particle

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

What is the maximum number of electrons that an atomic orbital can contain?