Which of those molecules are polar . co2,so2,ch2cl2 ,pcl3

SO2- It is polar because it has dipole moment.

CH2Cl2

PCl3

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

it's c. elements are placed in rows based on how may valencies electrons have.