Which of the following gives the correct numbers of protons, neutrons, and electrons, respectively, in a neutral atom of Potassium?
A) 19 protons, 20 neutrons, 19 electrons
B) 39 protons, 20 neutrons, 39 electrons
C) 20 protons, 19 neutrons, 19 electrons
D) 39 protons, 20 neutrons, 19 electrons

In a chemical reaction at equilibrium, the rate of the forward reaction the rate of the reverse reaction. if the rate of the forward reaction more products are formed.

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?