Hell Particles in the air appear to be moving in different directions because(select the best answer as discussed in the notes/video):

A. the dust particles are less dense the dust particles are less dense

B. the dust particles are giving off there own energy

C. gas molecules are constantly in motion and collide with the dust particles gas

D. water molecules are sliding past each other

c

Explanation:

you don't think of particles as dense and less dense

dust particles containvenergy but won't release it unless acted upon a force

gas molecules move freely and collide with dust particles which is correct

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.