How were elements in the first periodic table arranged?
The elements in Mendeleev's first periodic table were arranged by increasing atomic weight, kinda like organizing a bookshelf by book size!
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Mendeleev sorted elements by their atomic mass but also left gaps for undiscovered elements. Talk about forward-thinking!
He arranged them by atomic mass, but grouped them so elements with similar properties were in the same column. Genius, right?
Mendeleev arranged them by atomic weight and predicted missing elements鈥攑retty cool when you think about it.
Atomic mass, simple and effective back in the day!
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