How mendeleev’s periodic table differs from moseley’s

Moseley didn't develop a Periodic Table. Mendeleev's Periodic Table placed the elements in order of increasing atomic mass, but there were some anomalies. Iodine (126.9 u) had a lower atomic mass than tellurium (127.6 u), and nickel (58.6 u) had a lower atomic mass than cobalt (58.9 u). Moseley showed that these anomalies vanished if the atoms were arranged in order of increasing atomic number. Thus, 52-Te comes before 53-I, and 27-Co comes before 28-Ni. Periodic Tables ever since then have listed the elements in order of atomic number.

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