How many neutrons make up one of these potassium atoms

A toy that is green under white light is illuminated by blue and green light, what color do you perceive?

How many grams of neon gas should be placed into a 10.0 L container in order for it to meet STP conditions? 12.2 g 9.00 g 0.00441g 122 g

Why the radius of an atom cannot be determined precisely?

How many moles of helium gas are contained in 4.0: flask at STP

How does the substance change while energy is being added to the liquid at 20 degrees celsius?

What is limiting reajent?

What elements react the most? Like have the most reactivity.

A neutral atom has an atomic number of 20 and a mass number of 42. How many electrons does the atom have?

A rock is placed into water and the volume of water increase 15ml. what is the density of the rock if it had a mass of 24.3 grams.

Suppose a student did not fully redissolve the Al (OH) 3 that initially formed upon the addition of H2SO4. Predict and explain how this would impact the apparent percent yield this student determines.