How many valence electrons, electrons, protons, and neutrons does silicon have?

What type of valcano formed from dry eruptions top is usually blown out

If the wavelength of the red line of hydrogen coming from a galaxy is 654.3 nanometers instead of the normal 656.

A car is initially moving at 35 km/h along a straight highway. To pass another car, it speeds up to 135 km/h in 10.5 seconds at a constant acceleration.

What is the impulse when a. 200kg ball is struck with a force of 100N for. 1 seconds

A snowball is launched horizontally from the top of a building at v = 19.6 m/s. If it lands d = 64 meters from the bottom, how high (in m) was the building?

What are the steps that produce electricity from this fuel

Adrian read about a new antimicrobial in a popular magazine. The advertisement claimed that the product Bactokil prevents bacterial growth. So, Adrian conducted a controlled experiment to test the product claims.

A world-class sprinter can burst out of the blocks to essentially top speed (of about 11.5 m/s) in the first 15.0 m of the race. what is the average acceleration of this sprinter, and how long does it take her to reach that speed?

How are primary and secondary succession similar and how are they different?

What relates the net force exerted on an object to its mass and acceleration?