Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
I think the correct answer is A
Answer: The average kinetic energy in an object or substance tells us its mass. Kinetic energy has a direct relationship with mass, meaning that as mass increases so does the kinetic energy of an object.
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