... all the shells are full so it is a strong particle however it is not as strong as helium this is because the more shells the nuclei has more difficulty keeping them. Argon is situated in the noble gasses which is on the far right hand side, it is from within group 0 period 3. The structure of the atom is shown below in the diagram. The electron structure for calcium is 2,8,8,2, so the first three shells are full however the last shell only has two electrons this would make it a little bit active as it would be easier for this particle to lose two shell in stead of gaining six. Calcium is situated in the reactive metals. This is on the left-hand side of the periodic table. Its is with in group 2 period 4. The structure is shown below in the diagram. ...

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