With chemistry. will give how does this have 17? ? i counted 18. what am i not understanding?

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.