An atom that has 13 protons and 15 neutrons is an isotope of the element? How can I count it?

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it's simple. the number of protons in an atom never changes. And also, the no of protons is its atomic number.if you look up the periodic table, you will find a number on the top - left corner of each of the boxes. This is the atomic number.No 2 same elements on the periodic table have the same atomic number. So, all you have to do is search for a box that has the number 13 on it. and by the way ... the element which you're searching for is Aluminium

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