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A Periodic Table. Count the number of electrons neutrons and protons and the rings which contain the electrons. Then refer to the table. It's group number is the number of electrons in the outer shell. The period number is the number of shells in the atom (the rings).

So one ring with one electron in it would be group one, period one. Which is the element hydrogen.

4 rings with 2 electrons in th outer ring would be calcium etc.

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u need to know how many protons there are

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Q: If i wanted to find the chemical element of an atom what will i need?
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