Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best
conclusion about Particles A and B?
They have opposite charges.
O They are located in the nucleus together.
O Particle A has a negative charge, and Particle B is neutral.
O Particle A orbits the nucleus, and Particle B is located in the nucleus.

How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements.test the niobium sample for the presence of niobium oxide compounds.heat the niobium, and see if the level of radioactivity in the lab increases.place the niobium under pressure, and see if the level of radioactivity in the lab increases.