4. How many neutrons are there in an atom of protium? Deuterium? Tritium?

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.

What ia the energy of an object because of its potential and kinetic energies

Elements on the periodic table are ordered according to their