What is the same about all atoms of one element


Same number of valence electrons


The way that the periodic table is designed is so that all elements in the same group will have the same number of valence electrons. This is because elements can have the same number of valence electrons despite having different totals of electrons, because the valence electrons can reside in any valence shell.

Atomic mass changes for every element, and the elements get heavier the further down the table you go, so it is not atomic mass.

Hope this helped!

All atoms of an element have the same number of protons. The number of protons in an element is a primary identifier known as its atomic number.

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