All atoms of the element potassium have 19 protons. One How many neutrons make up one of these potassium of the most stable types of potassium atoms has the atoms?
mass number 39.
A.19
B.20
C.38
D.58

Which are examples of projectile motion? choose all that apply a. a soccer ball rolling across the ground in the northeast direction b. a car turning a corner, so it is heading south c. a javelin flying through the air d. a tennis ball lobbed over the net

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s.what is the wavelength?