2.845x 10^2 potassium ions equals how many of potassium ions?

During which time interval does the object travel approximately 10 meters

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.