In which orbitals with the valance of electrons for selenium be placed

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out