Which of the following electron configurations for neutral atoms is correct?

helium: 1s1, 1p1

nitrogen: 1s2, 2s2, 2p3

silicon: 1s2, 2s2, 3s2, 2p63p2

the third sub-level

Li

A star may form a black hole once it cannot?

We consider a gas in thermal equilibrium with a reservoir. If a piston does a certain amount of work on the gas W very slowly (isothermal compression), how does S change for the gas? S should decrease right?

A 7.26kg bowling ball (16 pounds) is at rest what is the net force on the bowling ball

All the forces acting on an object

Why does a boat that is bumped by a wave not actually move to another position in the water

What is the simplest relationship between the angular wavenumber k and just one of the other kinematic variables? Express your answer using only one of the other kinematic variables plus constants like π.

The pilot of an airplane notes that the compass indicates heading west. The airplane's speed relative to the air is 100 km/h. The air is moving in a wind at 25.0 km/h toward the north.

How do you get a resultant factor? A. Add two or more vectors B. Add two scalars C. Multiply two scalars D. Multiply two vectors

A panpipe is made of five pipes. The longest pipe is 25 centimeters long and the shortest is 5 centimeters long. Which of these pipe produces the highest-frequency sound and why?

Model rocket A is launched at an angle of 70° above the x axis, with an initial velocity of 40 m/s. An identical rocket B is launched under the same conditions at an angle of 90° above the x axis, also with an initial velocity of 40 m/s.