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nickel
It also tells you the number of electrons that the element has in its outside shells. If the atomic number of nickel is 28 then every atom of nickel has 28 protons in its nucleus and 28 electrons outside the nucleus.
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movement of particles of object from one place to another
e.g
spreading of perfume in air
spreading of ink in water
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The law of conservation of mass states that matter can not be created or destroyed in a chemical reaction.
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You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster
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