The answers that fit the blanks are SMALL and LITTLE, respectively. The particles or molecules or fas are small which makes it loose and easily moves around, and these only exert little attraction for other gas particles. The answer for this would be option D.
The rapid movement of gases molecules can be explained because gases have <u>small</u> size particles and exert <u>little</u> attraction for other gas particles.
<u><em>Explanation:</em></u>
<u><em>Effect of small size and little attraction:</em></u>
Due to small size of gases, they move so fast , collide with each others and wall of containers. Beside this, gases have weak or little inter molecular attraction , due to this they are not holded strong to each other and, they move apart to each other and move fast.
The number of protons in the nucleus of the atom is equal to the atomic number (z) and the number of electrons in a neutral atom is equal to the number of protons