Why does the atoms have to be the same numbers

Atoms of a particular element must have the same number with protons, but can have different numbers with neutrons. When an element has different variants while having different number of neutrons and the same number of protons. These are called isotopes.

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1) clean up you lab area2) dispose of the chemicals as instructed by your teacher3) put everything back where it belongs unless your teacher tells you otherwise4) dispose of gloves5) wash hands with soap and water