History of the periodic table

The idea of arranging the elements in the periodic table according to their chemical and physical properties is attributed to

• Mendeleev

• Ramzi

• Moseley

• Bohr

Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing

• atomic number

• density

• atomic mass

• reactivity

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Mendeleev did not always list elements in his periodic table in order of increasing atomic mass because he grouped together elements with similar

• atomic numbers

• densities

• colours

• properties

Mendeleev predicted that the spaces in his periodic table represented

• isotopes

• unstable elements

• undiscovered elements

• radioactive elements

The person whose work led to a periodic table based on increasing atomic number was

• Moseley

• Mendeleev

• Bohr

• Cannizzaro

Moseley's work led to the realization that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing

• atomic mass

• radioactivity

• atomic number

• density

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What are the radioactive elements with atomic numbers from 90 to 103 called?

• the noble gases

• the actinides

• the lanthinides

• the rare-elements

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What are the elements with atomic numbers from 58 to 71 called?

• the lanthanides

• the actinides

• the noble gases

• the alkali metals

Argon, krypton, and xenon are

• noble gases

• alkaline earth metals

• actinides

• lanthanides

The periodic law states that the physical and chemical properties of elements are periodic functions of their atomic

• masses

• numbers

• charges

• radii

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