3. How many valence electrons are in the outermost energy level of each of the following elements?

a. Helium

b. Lithium

c. Nitrogen

d. Magnesium

Two hockey players are traveling at velocities of v1 = 10 m/s and v2 = - 22 m/s when they undergo a head-on collision. after the collision, they grab each other and slide away together with a velocity of - 3.6 m/s.

The current in a toaster is 20 amps, and its voltage is 200 volts. What is the resistance in the toaster?

Sonja, the skater rolls down a ramp 50 meters and finishes in 5 seconds. what is her speed?

Your teacher burns a piece of steel wool in class, demonstrating the chemical property, flammability. You are curious to see what other things can demonstrate chemical properties. Which of these does not demonstrate a chemical change?

Which of the following is NOT an example of general characteristic of expository writing? Select all that apply ... clarity. coherence. poetic description. thoroughness. persuasiveness

Three resistors, R1 = 10 Ω, R2 = 20 Ω and R3 = 30 Ω are connected in series to a 12 V battery. Find: a. The equivalent resistance of the circuit. b. The current in each resistor. c. The voltage across each resistor. d.

What are the basic rules of basketball? Are the rules different for men's versus women's competition?

A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?

What would you predict about a chemical that has a hydrogen ion concentration of 1 * 10-12 M? It will form salt and water when added to a base. It contains no hydroxide ions. It has high concentration of hydroxide ions. It has a sour taste.

What are the three theories of light?