Elements which appear in the same column have similar properties (periodicity). For example, all of the elements in group XVII (17), the Halogens, all react in a similar fashion; they all like to attract one additional electron and form a -1 anion.
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A non example of a galaxy is a star
To find the neutrons you add the mass number and the atomic number for neutrons
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-Zayn Malik
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if u question my last question i will answer yours please
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