How many protons, neutrons, and electrons are there in an atom of potassium-39?

Which best explains why replicating an experiment should be done by someone other than the person who originally did the experiment?

Given the atomic radius of neon, 0.69 å, and knowing that a sphere has a volume of 4πr3/3, calculate the fraction of space that ne atoms occupy in a sample of neon at stp.

Friction is not related to the efficiency of a machine. True False

Prepare ~ 8.75 * 10-4 M CrO4 solution from the ~1.25 * 10-3 M K2CrO4 stock solution. Record the exact molarity of the stock solution. Calculate the required amount of stock solution to make 10.00 mL of dilute solution.

Missy Diwater, the former platform diver for the Ringling Brother's Circus had a kinetic energy of 15,000 J just prior to hitting the bucket of water. If Missy's velocity is 24.5 m/s, then what is her mass?

What is the resultant molarity of 20mL of a 3.5M solution is diluted to 100mL? Will mark brainliest

The shape of molecules that contain only two atoms is

Standing near a campfire, you can feel heat. This is an example of a) acceleration b) conduction c) convection d) radiation

Find the mass in grams of 2.00*1023 molecules of C10H140

Choose the substance with the lowest surface tension. Choose the substance with the lowest surface tension. a) H2O b) (CH3) 2CO c) CH3CH2CH2CH3 d) C6H6 e) CH3OH