1. Dust particles move randomly in one direction / all directions. 2. The dust particles are supported by a fluid. The fluid is a gas / liquid.
3. You cannot see the gas / dust particles directly as they are too small, but they are there.
4. The gas particles move slowly / quickly in random directions.
5. The particles have many / few collisions which means they bump into each other.
6. Each time a gas particle hits a dust particle, it moves away in the same / a different direction.
7. Robert Brown first observed this with pollen / sugar particles in water. 8. In this case, the fluid was a gas / liquid.
9.The pollen grains appeared to jiggle randomly because they were colliding with water molecules / air particles.

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.