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Compare the element hydrogen with the alkali sodium metal?

atomic weight of the two elements differ
Hydrogen has a single positive charge
Alkali metal (sodium) is more highly reactive than hydrogen

What does the periodic law state?

physical and chemical properties of elements and their periodic functions of their atomic numbers

What are the actinides?

elements with increasing atomic number of actinium
highly reactive and a solid at room temperature

Most chemically reactive elements?

Chlorine, Oxygen, Argon, and Neon

How is Moseley's basis arranging the elements different from Mendeleev's?

Mendeleev's periodic table was arranged according to the element's atomic mass increasing, as for Moseley's was increasing atomic number

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