Atomic structure and the Periodic table

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Last updated 1:39 PM on 4/8/26
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4 Terms

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what is the bottom number of an element in the periodic table called and what does it mean

atomic number and it says how many protons is in that element

2
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what is the top number mean in a element and what is it called

its called mass number and its the total of protons and neutrons there are in a element

3
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who was dmitri mendeleev

dmitri mendeelev in the mid 19th century he divided the periodic table and organised all elements

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