What did henry moseley determine that contributed to understanding the atom?

Henry Moseley is a Physicist. He used x-rays and discovered the atomic number of each element, that led to more accurate organization of the periodic table.

He arranged the elements in the periodic table by the number of protons of the elements not on the basis of atomic weights of the elements.

This disappeared the the flaws in the periodic table that had been making scientists uncomfortable.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.