The ideal gas model assumes that ideal gas particles: (select all that apply) take up a lot of volume take up negligible volume are attracted to other gas particles are not attracted to other gas particles

Answer is: take up negligible volume and are not attracted to other gas particles.

An ideal gas is:

1) made up of molecules which are in constant random motion in straight lines.  

2) all collisions are perfectly elastic, there is no loss of kinetic energy during the collision.

3) follows ideal gas law: p·V = n·R·T.

4) the gas particles have negligible volume.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.