When electrons are filling energy levels, the lowest energy sublevels are

occupied first. This is

A. None of these

B. The Aufbau principle

C. Hund's rule

D. Conservation of energy

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Pluto is no longer considered to be a planet. Therefore, how many planets are in the solar system?

Which of the following shows examples of things that convert chemical energy to mechanical energy? A Toaster and Fan B Fan and Microwave Oven C Airplane and human body D Micvrowave oven and blender

An example of a scalar is ___ and an example of a vector is ___. velocity; acceleration velocity; displacement speed; velocity distance; speed

Determine the value of Kc for the following reaction if the equilibrium concentrations are as follows: [H2]eq = 0.14 M, [I2]eq = 0.39 M, [HI]eq = 1.6 M. H2 (g) + I2 (g) ⇌ 2 HI (g)

If n = 2, what type of orbitals are possible? 1s, 2s, 2p, 3s, 3p, 3d

A container has a volume of 200 L at 0.94 atm and 25 C. The pressure changes to 1.00 atm and the temperature changes to 0 C. What is the new volume of the container

f litmus paper is dipped in an acidic solution and then in a basic one, what will happen? The paper will turn from blue to red. The paper will turn from red to clear. The paper will turn from blue to clear. The solution will turn from red to blue.

You need to make an aqueous solution of 0.125 M barium chloride for an experiment in lab, using a 250 mL volumetric flask. How much solid barium chloride should you add?

Relative to the sum of the masses of its constituent nucleons, the mass of a nucleus is: greater the same smaller sometimes greater and sometimes smaller

Smallpox epidemic among Native Americans?